Discuss

Ice on coils: Bad defrost heater, or thermostat?

 in

Refrigerator & Freezer Repair

. "

BACKGROUND: 8-year old fridge. Fridge display panel read 37F for fridge and 5F for freezer. My home thermometer reads 37F

..."
 
 
Register | FAQ's | New Posts | Today's Posts | Extras
Appliance Repair Forum > Appliance Repair Help > Refrigerator & Freezer Repair » Ice on coils: Bad defrost heater, or thermostat?

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 01-03-2012, 01:32 PM
Junior Member
 
Join Date: Jan 2012
Posts: 9
jcw2 is on a distinguished road
Default Ice on coils: Bad defrost heater, or thermostat?
Model Number: MFD2561HES   Brand: Maytag   Age: 5 - 10 years   

Appliance Parts from AppliancePartPros.com


BACKGROUND:
8-year old fridge.
Fridge display panel read 37F for fridge and 5F for freezer.
My home thermometer reads 37F and 28F, respectively.
Ice maker stopped making ice.
Noticed ice in back of freezer, upper right corner, encasing thermistor.
Noticed a lot of lint under fridge on those coils.
Compressor seems to have normal operational duty cycle.

WHAT I DID:
Vacummed off coils under fridge.
Opened up back panel of freezer.
Noticed ice built up around upper right corner, around copper tube, and top of fins.
Melted ice with blow dryer.
Waiting to see if freezer can now get back to normal, 0F.

QUESTIONS FOR YOU:
What caused this problem? Lint on lower coils? Bad defrost thermostat? Bad defrost heater? (Can a heater really fail?) Or something else? Thanks.

NOTE: I do not have a multimeter. I do not want to buy and replace more parts than necessary.


Related Models
Maytag MFD2561HES REF - BOTTOM MOUNTS
Maytag MFD2561HEW REF - BOTTOM MOUNTS
Maytag MFD2561KES REF - BOTTOM MOUNTS
Maytag MFD2562KEB10 REFRIGERATOR
Maytag MFD2562KEB11 REFRIGERATOR
Maytag MFD2562KES10 REFRIGERATOR
Maytag MFD2562KES11 REFRIGERATOR
Maytag MFD2562KEW10 REFRIGERATOR
Maytag MFD2562KEW11 REFRIGERATOR
Maytag MFD2562VEA1 REFRIGERATOR
Maytag MFD2562VEA10 REFRIGERATOR
Maytag MFD2562VEA2 REFRIGERATOR
Maytag MFD2562VEB1 REFRIGERATOR
Maytag MFD2562VEB10 REFRIGERATOR
Maytag MFD2562VEB2 REFRIGERATOR
Maytag MFD2562VEB3 REFRIGERATOR
Maytag MFD2562VEM1 REFRIGERATOR
Maytag MFD2562VEM10 REFRIGERATOR
Maytag MFD2562VEM2 REFRIGERATOR
Maytag MFD2562VEM3 REFRIGERATOR
Maytag MFD2562VEM4 REFRIGERATOR
Maytag MFD2562VEW1 REFRIGERATOR
Maytag MFD2562VEW10 REFRIGERATOR
Maytag MFD2562VEW2 REFRIGERATOR
Roper MFE14XW0 Microwaves*
Roper MFE14XW1 Microwaves*
Maytag MFF2258VEA10 REFRIGERATOR
Maytag MFF2258VEB10 REFRIGERATOR
Maytag MFF2258VEB2 REFRIGERATOR
Maytag MFF2258VEB3 REFRIGERATOR
Maytag MFF2258VEM2 REFRIGERATOR
Maytag MFF2258VEM3 REFRIGERATOR
Maytag MFF2258VEM4 REFRIGERATOR
Maytag MFF2258VEW10 REFRIGERATOR
Maytag MFF2258VEW2 REFRIGERATOR
Maytag MFF2557HEB REF - BOTTOM MOUNTS
Maytag MFF2557HEB14 REFRIGERATOR
Maytag MFF2557HEQ REF - BOTTOM MOUNTS
Maytag MFF2557HES REF - BOTTOM MOUNTS
Maytag MFF2557HEW REF - BOTTOM MOUNTS
Maytag MFF2557KES REF - BOTTOM MOUNTS
Maytag MFF2558KEB REF - BOTTOM MOUNTS
Maytag MFF2558KEB11 REFRIGERATOR
Maytag MFF2558KES REF - BOTTOM MOUNTS
Maytag MFF2558KES12 REFRIGERATOR
Maytag MFF2558KEW REF - BOTTOM MOUNTS
Maytag MFF2558KEW11 REFRIGERATOR
Maytag MFF2558VEA1 REFRIGERATOR
Maytag MFF2558VEA10 REFRIGERATOR
Maytag MFF2558VEA2 REFRIGERATOR
Maytag MFF2558VEB1 REFRIGERATOR
Maytag MFF2558VEB10 REFRIGERATOR
Maytag MFF2558VEB2 REFRIGERATOR
Maytag MFF2558VEB3 REFRIGERATOR
Maytag MFF2558VEM1 REFRIGERATOR
Maytag MFF2558VEM10 REFRIGERATOR
Maytag MFF2558VEM2 REFRIGERATOR
Maytag MFF2558VEM3 REFRIGERATOR
Maytag MFF2558VEM4 REFRIGERATOR
Maytag MFF2558VEQ1 REFRIGERATOR
Maytag MFF2558VEQ10 REFRIGERATOR
Maytag MFF2558VEQ2 REFRIGERATOR
Maytag MFF2558VEW1 REFRIGERATOR
Maytag MFF2558VEW10 REFRIGERATOR
Maytag MFF2558VEW2 REFRIGERATOR
Frigidaire MFF312BFWB Frg(v1) / Electric Range
Frigidaire MFF312BFWC Frg(v2) / Electric Range
Frigidaire MFF312BFWE Frg(v3) / Electric Range
Frigidaire MFF312BSF ELECTRIC RANGE
Frigidaire MFF312HSC ELECTRIC RANGE
Frigidaire MFF318BGDA Wwh(v1) / Electric Range
Frigidaire MFF318BGWA Wwh(v2) / Electric Range
Frigidaire MFF351BCWC Frg(v1) / Electric Range
Frigidaire MFF351BCWD Frg(v2) / Electric Range
Frigidaire MFF351BCWE Frg(v3) / Electric Range
Maytag MFI2067AEB REF - BOTTOM MOUNTS
Maytag MFI2067AEB12 REFRIGERATOR
Maytag MFI2067AEB13 REFRIGERATOR
Maytag MFI2067AEB4 REFRIGERATOR
Maytag MFI2067AEB5 REFRIGERATOR
Maytag MFI2067AEQ REF - BOTTOM MOUNTS
Maytag MFI2067AEQ12 REFRIGERATOR
Maytag MFI2067AEQ13 REFRIGERATOR
Maytag MFI2067AEQ4 REFRIGERATOR
Maytag MFI2067AES REF - BOTTOM MOUNTS
Maytag MFI2067AES12 REFRIGERATOR
Maytag MFI2067AES13 REFRIGERATOR
Maytag MFI2067AES4 REFRIGERATOR
Maytag MFI2067AES5 REFRIGERATOR
Maytag MFI2067AES6 REFRIGERATOR
Maytag MFI2067AEW REF - BOTTOM MOUNTS
Maytag MFI2067AEW12 REFRIGERATOR
Maytag MFI2067AEW13 REFRIGERATOR
Maytag MFI2067AEW4 REFRIGERATOR
Maytag MFI2266AEB10 REFRIGERATOR
Maytag MFI2266AEB11 REFRIGERATOR
Maytag MFI2266AEQ10 REFRIGERATOR
Maytag MFI2266AEQ11 REFRIGERATOR
Maytag MFI2266AES10 REFRIGERATOR
Maytag MFI2266AES11 REFRIGERATOR
Maytag MFI2266AEU10 REFRIGERATOR
Maytag MFI2266AEU11 REFRIGERATOR
Maytag MFI2266AEW10 REFRIGERATOR
Maytag MFI2266AEW11 REFRIGERATOR
Maytag MFI2269VEA1 REFRIGERATOR
Maytag MFI2269VEA10 REFRIGERATOR
Maytag MFI2269VEB1 REFRIGERATOR
Maytag MFI2269VEB10 REFRIGERATOR
Maytag MFI2269VEB2 REFRIGERATOR
Maytag MFI2269VEM1 REFRIGERATOR
Maytag MFI2269VEM10 REFRIGERATOR
Maytag MFI2269VEM2 REFRIGERATOR
Maytag MFI2269VEM3 REFRIGERATOR
Maytag MFI2269VEQ1 REFRIGERATOR
Maytag MFI2269VEQ10 REFRIGERATOR
Maytag MFI2269VEW1 REFRIGERATOR
Maytag MFI2269VEW10 REFRIGERATOR
Maytag MFI2568AEB REF - BOTTOM MOUNTS
Maytag MFI2568AEB12 REFRIGERATOR
Maytag MFI2568AEB13 REFRIGERATOR
Reply With Quote
See inside of your appliance - diagrams and part photos for virtually every model.

powered by AppliancePartsPros.com
 
  #2 (permalink)  
Old 01-03-2012, 04:52 PM
Gene's Avatar
Senior Expert
APP Volunteer
 
Join Date: Jul 2007
Location: Orange County, California
Posts: 27,171
Gene has a brilliant futureGene has a brilliant future
Default

Wait one or two more days to see if the cleaning helped. Make sure the back panel in the freezer is in place.

If the temperature is still not good, you have to buy a multimeter.

Let us know when you ready. Check the evaporator coils and post the result.

Here are the breakdown diagrams and Replacement parts for MAYTAG MFD2561HES REF - BOTTOM MOUNTS | AppliancePartsPros.com

Gene.
__________________
Appliance Repair Expert in Orange County, California.

Order Appliance Parts with 365-Day Hassle Free Return Policy - AppliancePartsPros.com
Reply With Quote
  #3 (permalink)  
Old 01-03-2012, 05:33 PM
Junior Member
 
Join Date: Jan 2012
Posts: 9
jcw2 is on a distinguished road
Default

Back panel was put back in place after defrosting with blow dryer, at 4pm local time. My fridge has been showing me these temperatures so far ...

5pm: 44F fridge and 33F freezer.
6pm: 41F fridge and 30F freezer.
7pm: 41F fridge and 29F freezer.
8:18pm: 40F fridge and 28F freezer.

Is it normal for temps to drop this slowly?

(Will get a multimeter, and give you status in about 24 hours.)
Reply With Quote
  #4 (permalink)  
Old 01-03-2012, 05:46 PM
Gene's Avatar
Senior Expert
APP Volunteer
 
Join Date: Jul 2007
Location: Orange County, California
Posts: 27,171
Gene has a brilliant futureGene has a brilliant future
Default

Let him stay for about 24 hours, then check it. Try not to open the doors.

Gene.
__________________
Appliance Repair Expert in Orange County, California.

Order Appliance Parts with 365-Day Hassle Free Return Policy - AppliancePartsPros.com
Reply With Quote
  #5 (permalink)  
Old 01-05-2012, 08:26 PM
Junior Member
 
Join Date: Jan 2012
Posts: 9
jcw2 is on a distinguished road
Default

It has been 48 hours since we defrosted him.
Fridge leveled out at 37F, freezer doesn't go below 28F.
Ice is reforming on the back (inside) of the freezer compartment.

What do you think?
Replace defrost heater and defrost thermostat?

Will that definitely fix him for good?
Reply With Quote
  #6 (permalink)  
Old 01-09-2012, 09:27 AM
Junior Member
 
Join Date: Jan 2012
Posts: 9
jcw2 is on a distinguished road
Default

Freezer levels out at about 28F.
Fridge achieves requested setting temperature of 37F.

Have manually defrosted the coils twice now.

Plan to replace defrost thermostat and defrost heater tomorrow (assuming that the ordered parts arrive).

Any comments?
Reply With Quote
  #7 (permalink)  
Old 01-09-2012, 03:26 PM
Gene's Avatar
Senior Expert
APP Volunteer
 
Join Date: Jul 2007
Location: Orange County, California
Posts: 27,171
Gene has a brilliant futureGene has a brilliant future
Default

Before you replace these two parts you may want to check them for continuity. It is possible that the problem is a bad control board (#5 on the diagram) and only continuity test on the defrost heater and defrost thermostat can help you to determine it.

Gene.
__________________
Appliance Repair Expert in Orange County, California.

Order Appliance Parts with 365-Day Hassle Free Return Policy - AppliancePartsPros.com
Reply With Quote
  #8 (permalink)  
Old 01-09-2012, 03:53 PM
Junior Member
 
Join Date: Jan 2012
Posts: 9
jcw2 is on a distinguished road
Default

Good idea.
I now have a multimeter.
I found your historic article on continuity testing, but if I recall correctly it did not explicitly cover fridges.
Can you provide a link to step-by-step testing of the defrost heater and thermostat? Or is it simple enough to describe in e-mail?

Heater:
(1) Disconnect both ends?
(2) Touch multimeter leads to what pins?
(3) For a good part, what reading should I get?

Thermostat:
(1) Should fridge power be ON or OFF?
(2) Are leads on thermostat exposed?
(3) For a good part, what reading should I get?

Thanks.
Reply With Quote
  #9 (permalink)  
Old 01-09-2012, 04:32 PM
Gene's Avatar
Senior Expert
APP Volunteer
 
Join Date: Jul 2007
Location: Orange County, California
Posts: 27,171
Gene has a brilliant futureGene has a brilliant future
Default

Quote:
Originally Posted by jcw2 View Post
Good idea.
I now have a multimeter.
I found your historic article on continuity testing, but if I recall correctly it did not explicitly cover fridges.
Can you provide a link to step-by-step testing of the defrost heater and thermostat? Or is it simple enough to describe in e-mail?

Heater:
(1) Disconnect both ends?
(2) Touch multimeter leads to what pins?
(3) For a good part, what reading should I get?

Thermostat:
(1) Should fridge power be ON or OFF?
(2) Are leads on thermostat exposed?
(3) For a good part, what reading should I get?

Thanks.
The refrigerator has to be unplugged. Both the heater and the thermostat must be disconnected. You can cut a wire for the test and splice it together after. The thermostat must be ice cold. The normal reading for the thermostat should be close to 0 Ohms and for the heater between 20 to 40 Ohms.

Gene.
__________________
Appliance Repair Expert in Orange County, California.

Order Appliance Parts with 365-Day Hassle Free Return Policy - AppliancePartsPros.com
Reply With Quote
  #10 (permalink)  
Old 01-10-2012, 05:05 PM
Junior Member
 
Join Date: Jan 2012
Posts: 9
jcw2 is on a distinguished road
Default

Got readings of appx 0 ohms for the defrost thermostat, and about 23 ohms for the defrost heater. Replacement parts were already ordered, so I paid for them and installed them. I've got the fridge buttoned up and will see if my troubles continue.

If troubles continue, at least I can rule out those two items as possible culprits.
Reply With Quote
See inside of your appliance - diagrams and part photos for virtually every model.

powered by AppliancePartsPros.com
 
Reply


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
PLZ HELP! Defrost heater behind evaporator coils mydogsmom Refrigerator & Freezer Repair 0 06-18-2011 09:57 PM
Question about replacing thermostat/defrost heater texparamedic Refrigerator & Freezer Repair 2 03-31-2011 02:06 AM
Heater, defrost / Thermostat / detrost Ohms sccraven Oven Repair (including Ranges and Cooktops) 0 09-27-2009 01:21 PM
Replaced defrost heater...coils frosting over again..what next? Momto8 Refrigerator & Freezer Repair 1 06-15-2009 04:43 PM
Defrost Heater and Thermostat rick12 Refrigerator & Freezer Repair 3 10-28-2008 11:31 AM



All times are GMT -7. The time now is 08:27 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 - 2014, 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