Heating/cooling unit- Run for a certain minute then it turn-off
We have a roof heating/cooling unit carrier model no. 48tje006, ser.No. 3499g21132 and it prompts at the panel 4 red light flushing means- "4 consecutive limit switch faults". What does it mean this problem? It is the thermostat problem need to replace?.Please answer and give me an idea howto solve.
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Seems like the fan relay has stuck (Likely to be on the main indoor PC board) or if the machine was being used on heating mode, the indoor pipe sensor may have failed causing the fan to continue to run. Most air cons on heating mode, will keep the fan running for a few minutes after you switch off on heating mode to cool down the indoor unit before it turns off completely. The pipe sensor signals the main PC board to tell it that the unit has cooled down and can now turn off completely. If either of the above faults occur, the indoor fan will keep running all the time.
If the air conditioner compressor runs all the time the main control board might be defective. The main control board provides the voltage to the fan motor and compressor. These boards are often misdiagnosed. Check all other components to be certain this is the cause of the problem.
The refrigerant and compressor are related in cooling the room.As for heating problem the thermostat needs to be checked.
if you're used to a certain temperature of air and your heat pump is producing much cooler air, take the following steps. (Note that a heat pump may go into a defrost mode to prevent icing. When this happens, it can temporarily output cold air. Also be aware that the heat pump will have to work harder to produce heat.)
1) First be sure the thermostat is set properly. Try raising the set temperature 5 degrees F. and waiting a few minutes.
2) Be sure the room-heating registers are open.
3) Check the heat pump filter. If it's dirty, change it.
4) Be sure the auxiliary heating elements are working .
5) Clean the coils of the outdoor condensing unit. If still the same problem then thermostat needs to be checked and replaced. Thanks.