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No heat problems are caused by several things. First lets do the easy thing and turn off the Dryer CB by pushing it HARD to off and then back on. Re-test for heat. Next try different cycles as in Air Fluff, Delicate, regular etc... Air fluff is no heat but see if it heats on other heat temp selections. If you get heat on a different heat selection then the problem is probably an open thermostat. If you still get no heat the most likely suspect is the heating element. If the heating element is fine then your looking at the motor switch or wiring as the problem. Component of last resort to replace is the timer. At this time I suspect either a high limit thermostat or an open heating element. Mond you since you did not include your complete model number this response if for an electric dryer. IF your dryer is gas respond with a model number please so I can point to other things that cwill cause a no heat symptom.
if your heat strips are not coming on, then there are a few things to check.
The first one would be that the heat strips are actually working. The easiest way to complete this task is to turn the system on into emergency heat and turn the thermostat up. If you get heat accompanied by the traditional strip heat burnt smell, then you know the electric heat strips are working.
The second thing would be that the air handler is receiving a command for heat during defrost cycle. If the command is present with no heat, then you most likely have either a wiring issue or a failed electrical relay or contactor.
The third thing would be the defrost board itself, for it is the component that calls for electric heat strips to come on during a defrost cycle. You may or may not be able to force the defrost board into a defrost cycle and then check that the heat strips are on or not.
It sounds as though your defrost board is bad with the symptoms you are describing.
It is possible that you have one or a combination of a few different problems here.
If your heat pump will not come on but the air handler works, the first thing you want to check is that the circuit breaker and disconnect for the heat pump are both on.
The next thing to check is that the heat pump is receiving a call for heat from the thermostat. If there is no call for heat at the heat pump, then your problem is most likely a low voltage issue. This could range from a failed thermostat to a low voltage wire that is bad.
If your heat pump has high voltage supplied and there is a call for heat present with no heat pump running, you are going to be isolating the problem to the heat pump itself. The problem could lie within any of the electrical components in the heat pump from a bad capacitor, a failed contactor, or a failed defrost control board.
Q - My electric dryer runs but will not heat, what could stop my dryer from heating? A - Things that could stop a electric dryer from heating: - house fuse or breaker ( needs two of them ), heating element, burnt wire, thermostat(s), thermal fuse ( not all models ), motor heat switch, timer, selector switch, burnt power cord/plug. A ohm meter test for these parts is here. Q - My gas dryer will not heat, what could stop my dryer from heating? A - Things that could stop a gas dryer from heating: - glow bar igniter, thermal fuse ( not all models ), coils on the gas valve, gas valve, thermostats,motor heat switch, timer, selector switch, sensor. A page for checking gas dryers is here.
Could be a couple of things. The first thing that I would check would be the coolant level in the radiator, if that is low it can cause the heater not to blow hot air. The second thing I would find out is if the control to change from cold to hot is actually working? ( if it is a manual slider then the cable might have come off of the control behind the dash...if it is digital then there may be a wire off?) The third thing it might be is that your Heater Core went bad and will need to replaced. As I said above, I would check the coolant level first and go from there. Hope it helps!