There are five major electrical parts involved in the heating process:
1. High limit thermostat (#17 on the
gas valve break down diagram)
2. Cycling thermostat (#8 on the
motor break down diagram)
3. Igniter (#4 on the
gas valve break down diagram)
4. Flame sensor (#18 on the
gas valve break down diagram)
5. Gas valve coils (#7 on the
gas valve break down diagram)
How to find out which part causing the problem?
Pretty simple: all of these parts have to be tested for continuity in the above sequence.
The following article on our forum will explain in detail how to run a continuity test using either an analog meter or a digital meter -
How To Check Continuity With Ohmmeter
If any of them is open – it has to be replaced.
Gas valve coils also could be tested by resistance. There are two coils – one with three terminals and one with two terminals.
1. Coil with two terminals should have 1220 ± 50 Ohms
2. Coil with three terminals if held with terminals in upper position:
a) across the left and the middle terminals – 1365 ± 25 Ohms
b) across the left and the right terminals – 560 ± 25 Ohms
- The part number for the high limit thermostat is
AP275754
- The part number for the cycling thermostat is
AP276896
- The part number for the igniter is
AP3109449
- The part number for the flame sensor is
AP2910747
- The part number for the gas valve coils kit is
AP3094251
Here are the break down diagrams for the Maytag dryer
Model MDG7057BWQ
Gene.