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Joined: 2/16/2014(UTC)
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Worked the other day and then next time I tried it there was/is no heat.
Checked the continuity of Thermal Cut off, thermostat and heating element all check good (continuity). Tested these with all wires disconnected.
Visually checked the heating element was not shorted to chassis.
Noticed what seems to be two other sensors on exhaust port. One of these has two connections (continuity tested good on this item) while the other has four connections (continuity checked open on this). The four connector device is located close enough to the exhaust opening that I could reach inside and feel it.
Checked for 240 at wiring terminals but did not check anywhere else.
Found diagram at ********************************.com but could not locate four connection device or what its function is. May not have anything to do with my trouble.
Any ideas are greatly appreciated.
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Rank: Advanced Member
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Joined: 2/29/2008(UTC)
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The thermostat on the heater is actually a hi-limit thermostat. The thermal cut-off is actually a fuse in case the hi-limits contacts weld together. On the blower: The two wire device is a thermal fuse. It will kill power to the motor. The 4 wire device is the operating/cycling thermostat. The outer two connectors are the thermostat's contacts. Should be 0 ohms at room temperature. The inner two connectors are the internal heater. It is turned on when using lower heat settings. Adds heat to the thermostat which results in it cycling more often reducing the main heaters output. Usually in the 5,000 to 10,000 ohm range. It is probably on you wiring diagram just not where you would expect to see it. Click on the below picture for more info on the part. Part number: AP3131939
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