Question about Heating & Cooling
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Posted on Jan 02, 2017
SOURCE: Electric Heater Coils Always On
We use the STW0925H! in 60 rooms on this property and have encountered similar problems that were caused by weldedd contacts on one of two relays that controls the electric strip heat. They can be replaced if needed.
PTHP's and PTACs employ thermal fuses as well as a bimetal limit stat on the heating element to limit risk if fan motor were to fail and the heating element were to remain energized. It would be wise to check that both are fuctioning properly while you are servicing the unit.
Posted on Mar 07, 2008
you have lost all control voltage. that is generated in the furnace. either the transformer has failed or the fuse in the transformer board has blown or the circuit breaker to the furnace has tripped or you have an open circuit to the furnace in the high voltage wiring. grab a volt meter and start with checking high volts at the furnace and back to the panel. if you have volts then start checking to see if transformer is generating low volts. as a side, if this is a furnace be sure the door is on secure and the door safty switch is depressed or guess what! no fan no volts no nothing. if any lights on board are flashing etc then you have power and it becomes a control problem. be sure your low voltage is getting sent to the stat via red and common on the furnace terminal board. good luck
Posted on Oct 30, 2008
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