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There is no antifreeze in the system. The system is filled with liquid gas and gaseous gas. On the heating cycle, the inside coils should get hot and the outside coils should get cold. In the summer, the heat pump reverses to provide Air Conditioning, the outside coils get hot and the inside coils get cold. They shouldn't really ice up because there is a defrost cycle. You need professional service by an Intertherm technician.
It sounds like the flame sensor is bad. If thats not the case you may need to replace the control board. You should make sure the flame sensor is directly into the flame.
Oven has three modes: 1) oven mode cycles elements on and off to maintain a specific temp setting for up to 60 min. 2) toast should keep all elements on for a few min. 3) broil mode top elements only always on, up to 60 min. Make sure you have dials in correct position and use the toast timer.
some times heat pumps have a fan cycling switch to keep the head pressure normal in cool weather or check the defrost relay for the fan when a heat pump condenser gets frosted it will stop the fan and reverse into cooling mode for a few min. to melt the ice and this function is done by a relay or a printed circuit board if it goes bad you wont have voltage to the fan
Your blower motor has several speeds to it and by the problem you are having it sounds as though the blower motor may be going out. The motor has a slower speed for the heating cycle and since you have the noise in the heating mode I suggest having the blower motor changed as soon as possible since it could cause other problems in the heating section of the furnace( possibly burning out the high limit switches). Good Luck on your repairs hope this helped
Make sure fan relay is wired correctly (G) wire. Ensure the fan on therm is not on, it should be on Auto or off.
If your furnace is short cycling because it has to keep heating your home, the delay in the control board may be staying on to compensate for the exchangers getting hot. If it heats normally, then put your attention to your thermostat.
Set the heating system on aux heat only. Fan should not be on, if it does stay on after a heating cycle, see if the furnace is heating normally, and reaching temp as desired before the heat comes off. Then check the therm wiring, pull the face of the therm, disconnect green wire (fan) and try the heating again.
You may have a problem with a temperature safety system. Before changing anything else, check to see if the unit is clean!!! Dirt/dust can fool the safety system into an overtemperature status. Inspect the heat coils for damage and dirt. Gently clean.
it is the heat sequencers. it happens all the time. replace them wire by wire to keep it simple. they are located behind the metal next to the breakers they look like this:
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