Oven not preheating to desired temp (replaced bake element and relay pcb)


Oven Repair (including Ranges and Cooktops)

. "

Greetings, I recently was experiencing an issue with my oven (an LG LRE30453ST) where it would not preheat past a

Register | FAQ's | New Posts | Today's Posts | Extras
Appliance Repair Forum > Appliance Repair Help > Oven Repair (including Ranges and Cooktops) » Oven not preheating to desired temp (replaced bake element and relay pcb)

Post New Thread  Reply By reading any content on this site you agree to AppliancePartsPros.com, Inc. disclaimer and Terms of Use.
LinkBack Thread Tools Search this Thread Display Modes
  #1 (permalink)  
Old 02-07-2013, 01:59 PM
Junior Member
Join Date: Feb 2013
Posts: 3
bds85466 is on a distinguished road
Thumbs up Oven not preheating to desired temp (replaced bake element and relay pcb)
Model Number: LG LRE30453ST   Brand: -brand-   Age: 1 - 5 years   

Appliance Parts from AppliancePartPros.com


I recently was experiencing an issue with my oven (an LG LRE30453ST) where it would not preheat past a certain point. For example, if I was trying to preheat to 350 it would make it up to about 285F and then stop. Or if it was 450, it would read out 385F and then stop, and begin to cool. I verified this using a meat thermometer. At any rate, I wanted to share and document my experiences on a forum to help any other DIYers out there that may run into the same problem.

For the record, I’m not an appliance expert, tech, or repairman by any means – though I do have an ok understanding of basic circuits and troubleshooting/etc as I have an engineering background. I’ve never attempted any of this, so if this info sounds dumb or obvious: LAY OFF – it was my first try hehe.

A day prior we were making a pizza @ 425F when we heard a loud buzz (maybe 2 seconds long) come from what we thought was the oven. Accompanying the buzz were all of our lights (I was downstairs at the time) getting very bright for the duration. It was very loud, sounded like the disposal was on but there was something jamming it. Thought it was weird, but didn’t think too much of it because nothing turned off, no fuses blew, and the oven remained at 425F, and cooked the pizza just fine. After the 2 seconds, everything went back to normal…seemingly.

The next morning we made some breakfast rolls at lower temp, maybe 325F and it seemed to stall out at 285F, so we thought that was weird, but we simply turned the broiler on to get it up to temp and then monitored it. It came out fine but still, something was weird.

So I got to looking on the internet and I found a manual for my oven. It was very weird to me that it was heating to a certain point, but not getting fully hot to where we wanted. So heat *was* coming from somewhere and I could see the broil element getting cherry red during the preheating.

What I didn’t see was the baking element – it’s hidden under a false bottom floor on my oven. How INconvenient.

Reading about common oven problems, many people recommended starting with the basics, baking and broiling elements to make sure they’re continuous.

So I started by unplugging the oven, letting it cool as I pulled off the back panel (like 10 screws). It uncovered a jungle of wires and screws, but I could see where the leads were going to the broil and bake elements.

So I popped my meter across the leads for the broil element: Looked good at 14ohms.

The baking element on the bottom, not so good. No continuity. Should be at roughly 17ohms according to the service manual. So I pulled it out.

Pulling out the bottom element required the removal of the incoming power terminal block as well as clipping some strategic points with a metal shears. An angle wire cutter would work perfect as well. After that you have to peel back some fiberglass insulation to get at the bracket with screws on it. Got the remaining screws out then gently tugged the thing out.

After I got the element I found it to be very severely blistered in a 6” section, and broken in the middle . Yep that was definitely a problem! Probably the reason for the loud noise, the element arching like crazy and boiling over. See the photos.

So I was like at least I found the problem, but, great, how much is this gonna cost me? Went back online, found the bake element (after a while of searching for LG parts) for like $38. Not to shabby.

Ordered it and waited the 3 days to ship, thinking, I’m the man – it’s as good as fixed.

Got it out of the box and installed it in reverse order, being very gentle with the new element (even wore gloves to avoid getting hand oils on it).

Reattach all the terminals, leads, close it up, etc and begin preheating to 450F. Everything’s looking good so far it’s heating up fast! Relays are clicking in the back like it’s working well on that new element.

It gets to 385 or so and then quits getting hotter. It does the exact same thing as it did prior to the new element install. WTF? Back to the drawing board.

Start digging deeper, nothing else “appears” to be broken, thermostat is reading correct ohms, thermal fuse is good, everything else on the cooktop works like a dream. Just would not get up through those extra 50F or so….

Though it looked like it was in wonderful shape from the front, I decided to take all the leads off and pull out the oven relay PCB, which according to most troubleshooting manuals would be the next place to check.

Once I got the leads off and unscrewed the board, it was apparent that the board had fried. Big black spot on the back of the board and the oven shell. The circuit board shorted out and burned right through. See the photos.

I was like, oh great, now how much is this gonna cost me? $28 online, shipped in 2 days.

Waited anxiously, plugged the new one in, and hit bake for 450. This time I monitored current going to the elements with my meter (clamp on style). Heated up quickly from 0-385F, then it paused. I was like here we go. And then I got that whiff of, oh yeah, new oven element. It started to pull itself up and inched its way all of the way to 450F. Problem solved.

But why the pauses and lapses in heat? Why could it get to 285, or 385 every time, but not to 450? Well, here’s my theory, and I think I can prove it now that I had my Amp readings for the elements.

Seems like the broil element (or a combo of broil + bake) is used to get the oven really hot quickly, and then the more even bake element is used to finish the preheat and to hold the temp as you bake. Obviously the relay sending power to the bake element for that last kick-in was not working due to the PCB blowout. The main PCB (the brain of the oven) still thought it was kicking everything in correctly. And since there were no main oven fault codes, it made sense that the main PCB was unaffected.

I then let it cool and did it again with my amp meter. Sure enough, that bake element kicked it in at the last part of the preheat 12-14 amps or so and stayed on.

At any rate, I got out of it without having to call a tech, saved some money (about 65 bucks for the components), and I learned a ton about making repairs to appliances (this was my first crack at any kitchen appliance). All in all, I’m glad I did it, and it didn’t take more than a little research, a little intuition, and a little cash.

Feel free to comment or ask questions, thanks for reading.


Related Models
Amana LG1009W DRYER- GAS
Amana LG1101 DRYER- GAS
Amana LG1112 DRYER- GAS
Whirlpool LG2001XSW0 Residential Dryer
Amana LG2112L DRYER- GAS
Amana LG2112W DRYER- GAS
Amana LG2401 DRYER- GAS
Amana LG2412 DRYER- GAS
Amana LG2501 DRYER- GAS
Amana LG2512 DRYER- GAS
Amana LG2811 DRYER- GAS
Amana LG2812 DRYER- GAS
Amana LG2911 DRYER- GAS
Amana LG2912 DRYER- GAS
Whirlpool LG3001XMW0 Residential Dryer
Whirlpool LG3001XMW1 Residential Dryer
Whirlpool LG3001XMW2 Residential Dryer
Whirlpool LG3001XPW0 Residential Dryer
Whirlpool LG3001XSW0 Residential Dryer
Whirlpool LG3006XPW0 Residential Dryer
Amana LG3412G DRYER- GAS
Amana LG3412L DRYER- GAS
Amana LG3412W DRYER- GAS
Amana LG3512L DRYER- GAS
Amana LG3512W DRYER- GAS
Amana LG3812L DRYER- GAS
Amana LG3812W DRYER- GAS
Amana LG3912L DRYER- GAS
Amana LG3912W DRYER- GAS
Frigidaire LG400AXD1 Wwh(v2) / 27 " Gas Laundry Center
Frigidaire LG400AXW1 Wwh(v1) / 27 " Gas Laundry Center
Frigidaire LG400MXD1 Wwh(v2) / 27 " Laundry Center
Frigidaire LG400MXD2 Wwh(v2) / 27 " Laundry Center
Frigidaire LG400MXW1 Wwh(v1) / 27 " Laundry Center
Frigidaire LG400MXW2 Wwh(v1) / 27 " Laundry Center
Frigidaire LG400SXD1 Wwh(v2) / 27 " Gas Laundry Center
Frigidaire LG400SXD2 Wwh(v1) / 27 " Gas Laundry Center
Frigidaire LG400SXD3 Wwh(v1) / Laundry Center
Frigidaire LG400SXW1 Wwh(v1) / 27 " Gas Laundry Center
Frigidaire LG400SXW2 Wwh(v2) / 27 " Gas Laundry Center
Frigidaire LG400SXW3 Wwh(v2) / Laundry Center
Amana LG4209L DRYER- GAS
Amana LG4209L2 DRYER- GAS
Amana LG4209W DRYER- GAS
Amana LG4209W2 DRYER- GAS
Amana LG4219L2 DRYER- GAS
Amana LG4219W2 DRYER- GAS
Amana LG4309L DRYER- GAS
Amana LG4309W DRYER- GAS
Amana LG4319L2 DRYER- GAS
Amana LG4319W2 DRYER- GAS
Amana LG4409L DRYER- GAS
Amana LG4409W DRYER- GAS
Amana LG4429L DRYER- GAS
Amana LG4429W DRYER- GAS
Whirlpool LG4441XWW0 Residential Dryer
Whirlpool LG4441XWW1 Residential Dryer
Amana LG4509L DRYER- GAS
Amana LG4509W DRYER- GAS
Amana LG4609L DRYER- GAS
Amana LG4609W DRYER- GAS
Amana LG4809L DRYER- GAS
Amana LG4809W DRYER- GAS
Amana LG4909L DRYER- GAS
Amana LG4909W DRYER- GAS
Whirlpool LG4931XMW0 Residential Dryer
Whirlpool LG4931XSW0 Residential Dryer
Whirlpool LG4931XTW0 Residential Dryer
Whirlpool LG4931XTW1 Residential Dryer
Whirlpool LG4931XTW2 Residential Dryer
Whirlpool LG4936XMW0 Residential Dryer
Whirlpool LG4936XMW1 Residential Dryer
Whirlpool LG5201XTW0 Residential Dryer
Whirlpool LG5201XTW1 Residential Dryer
Whirlpool LG5321XTW0 Residential Dryer
Whirlpool LG5531XKW0 Residential Dryer
Whirlpool LG5531XKW1 Residential Dryer
Whirlpool LG5531XMG2 GAS DRYER
Whirlpool LG5531XMN2 GAS DRYER
Whirlpool LG5531XMW0 Residential Dryer
Whirlpool LG5531XMW1 Residential Dryer
Whirlpool LG5531XMW2 GAS DRYER
Whirlpool LG5531XPW0 Residential Dryer
Whirlpool LG5531XSW0 Residential Dryer
Whirlpool LG5531XSW1 Residential Dryer
Whirlpool LG5536XPW0 Residential Dryer
Whirlpool LG5551XTG0 GAS DRYER
Whirlpool LG5551XTN0 GAS DRYER
Whirlpool LG5551XTW0 Residential Dryer
Whirlpool LG5601XMW0 Residential Dryer
Whirlpool LG5601XPW0 Residential Dryer
Whirlpool LG5601XSW0 Residential Dryer
Whirlpool LG5601XSW1 Residential Dryer
Whirlpool LG5606XPW0 Residential Dryer
Whirlpool LG5651XKW0 Residential Dryer
Whirlpool LG5651XKW1 Residential Dryer
Whirlpool LG5651XMW0 Residential Dryer
Whirlpool LG5651XMW1 Residential Dryer
Whirlpool LG5701XKW0 Residential Dryer
Whirlpool LG5701XMW0 Residential Dryer
Whirlpool LG5701XMW1 Residential Dryer
Whirlpool LG5701XMW2 Residential Dryer
Whirlpool LG5701XPW0 Residential Dryer
Whirlpool LG5701XSN0 GAS DRYER
Whirlpool LG5701XSW0 Residential Dryer
Whirlpool LG5706XPW0 Residential Dryer
Whirlpool LG5721XPW0 Residential Dryer
Whirlpool LG5721XSW0 Residential Dryer
Whirlpool LG5721XSW1 Residential Dryer
Whirlpool LG5726XPW0 Residential Dryer
Whirlpool LG5751XFW0 Residential Dryer
Whirlpool LG5751XKW0 Residential Dryer
Whirlpool LG5751XKW1 Residential Dryer
Whirlpool LG5751XMW0 Residential Dryer
Reply With Quote
See inside of your appliance - diagrams and part photos for virtually every model.

powered by AppliancePartsPros.com
  #2 (permalink)  
Old 05-21-2017, 06:13 PM
Junior Member
Join Date: May 2017
Posts: 1
klcme is on a distinguished road

We have the same problem with the same model LG LRE30453ST range. It starts to heat up but doesn't finish and then cools down so sometimes it will take much, much longer to bake something or it will overcook it because we have started only using convection bake since it keeps the oven hotter. We have removed the lower element and cannot see any flaws with it whatsoever. We then looked to see if the PCB you mentioned was burnt or black looking and it looks absolutely normal. This is so frustrating. Now I'm not sure what to do....order the element, the PCB, or something else. Anyone have any other suggestions. The oven does the exact same thing you describe here on regular bake where it won't reach the desired temperature. Any help is appreciated.
Reply With Quote
  #3 (permalink)  
Old 05-21-2017, 06:51 PM
Junior Member
Join Date: Feb 2013
Posts: 3
bds85466 is on a distinguished road

If you're serious a out doing it yourself, you'd first want to find the service​ manual or some pertinent online info. I can look around tomorrow to see if I have it in a PDF or something.

Do you have or can borrow a multimeter?

Starting with the element You could set your meter to resistance (ohms) and put it across the leads. The top broil should be 14ohms and the main element should be something around 17ohms. If you're getting something much higher or no reading you've got a bad element.

If they're good, it's probably 1 of the 2 pcbs (the one I replaced or the main).

Simply put, you could order one or both and replace them one at a time. A blunt guess and check method. If I were you I'd send back what you don't need.

Hope this helps get you started, good luck.
Reply With Quote
  #4 (permalink)  
Old 07-22-2017, 09:15 AM
Junior Member
Join Date: Jul 2017
Posts: 1
whitkim203 is on a distinguished road
Default LG Oven Won't Heat Past Pre-heat.

Hi Everyone,

So I followed this thread to diagnose my LG oven which seems to have the same common issue as everyone else and just won't complete the BAKE preheat cycle. I follow the above description and found no distress or significant wear on the bake element. I could change it just to be sure I suppose. Next I unhooked the PCB board nearest to the bake element and some other have noted black burn looking marks well my board looks perfect. I have looked at the main PCB board near the top and without unscrewing it, it also looks in really good shape.

I don't want to order parts just because but without similar signs of issues I am at a lost and unsure how to proceed. Here are the pictures below and I understand they are not the best quality.

Thank you,
Attached Images
File Type: jpg PCB.jpg (55.0 KB, 13 views)
File Type: jpg Bake.jpg (53.0 KB, 13 views)
Reply With Quote
  #5 (permalink)  
Old 07-24-2017, 11:19 AM
Junior Member
Join Date: Feb 2013
Posts: 3
bds85466 is on a distinguished road

Originally Posted by whitkim203 View Post
I don't want to order parts just because but without similar signs of issues I am at a lost and unsure how to proceed.
Thank you,
If you're serious about doing this yourself, download the service manual and go through the troubleshooting for "oven does not heat" step by step. You will need a multimeter, so either buy a cheap one (they're useful), borrow one, or rent one somewhere.


Therein lies all the info you need about the components and how to test them. In fact, there's even a simple flow chart for the condition pages 6-4 thru 6-6. If you're uncomfortable, hire someone.

As I mentioned above the only way to be sure your elements are good is to check their resistance via a multimeter. Electrical components can easily fail with no visible evidence.

Disconnect power.

Check for loose connections at bake, broil, and convection heater terminals.

Check bake heater resistance: should be approximately 17 ohms. If zero or something far from 17ohms replace it. If good, move on.

Check broil heater resistance: should be approximately 14 ohms. If zero or something far from 14ohms replace it. If good, move on.

Check for loose oven sensor connector.

Check oven sensor resistance: should be approximately 1.09 k-ohms. If not, needs replacing. If good, move on.

If all these things are in fact good by the meter readings, there's only two components left. The oven relay PCB and the main PCB.

I don't know of any way to check them exclusively/exhaustively.

Common sense says try replacing the oven relay pcb first since it's cheaper and easier.

If you want it done the quickest, I might order both and return the non-failed component. (or maybe they've both failed).
Reply With Quote
  #6 (permalink)  
Old 12-02-2017, 03:14 PM
Junior Member
Join Date: Dec 2017
Posts: 1
schaney is on a distinguished road

bds85466, thanks for posting the service guide link, used it to troubleshoot and fix the latest problem with my LRE30453.

-Purchased 07/09
-07/13, overheated, fried the bake/broil relay board and heat senor
-01/17, won't heat all the way up, no error codes. bake burner fried and found out there was an old recall on the top burner board.
- 12/17, won't heat all the way up, no error codes. this time purchased a multi-meter and used the service guide to troubleshoot. got down to replace bake/broil relay board, cost $43 + $6 shipping. replaced it, works fine now. Old board looked fine.

Overall I'm very dissatisfied with how it has failed 3 times now.
Reply With Quote
See inside of your appliance - diagrams and part photos for virtually every model.

powered by AppliancePartsPros.com

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Replaced bake element. Still no oven ScottZ Oven Repair (including Ranges and Cooktops) 1 10-27-2011 10:55 AM
Replaced bake element,but oven won't work ant1828 Oven Repair (including Ranges and Cooktops) 1 02-20-2011 05:20 AM
Oven Bake Element Replaced, still no heat hawkeye1315 Oven Repair (including Ranges and Cooktops) 3 12-22-2009 01:50 PM
Is my oven bake element bad or the relay?? cadillac62 Oven Repair (including Ranges and Cooktops) 1 03-11-2009 07:16 PM
Replaced Bake Element; Oven will not heat slkcd@suddenlink.net Oven Repair (including Ranges and Cooktops) 1 01-21-2008 10:46 AM

All times are GMT -7. The time now is 01:13 AM.

The content on this web site is for informational purposes only and is not intended to replace an on-site diagnosis from a qualified appliance service technician. By reading any content on this site you agree to AppliancePartsPros.com , Inc. disclaimer and Terms of Use.
Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO ©2011, Crawlability, Inc.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17