Fan Coil Unit Thermostat Not Working

Check under the unit and the cold exterior surface of the indoor coil enclosure.

Fan coil unit thermostat not working.

Fan will not come on in the on position or your fan will not come on when you turn the thermostat down in the air conditioning mode. If there is a circuit breaker for the fan coil unit disconnect the electric heat from this breaker and use a separate breaker for just the heating elements and connect it to power source you want. It sounds like the relay or control board in the unit is defective the thermostat tells the unit to come on in heat mode after that controls inside the furnace not thermostat should send power to the blower to come on. Choose the red and white wires if you are having problems with.

Now the blower and heat pump should operate but the electric heat will only start when the power is available via the separate. The engineering mindset 659 350 views. Condensing unit not turning on at all. If your system has frozen up turn off your thermostat for one to three hours to see if it unfreezes.

If it does not turn the furnace and air conditioner power back off again at the breaker panel. I am especially concerned about possible confusion between the fancoil s c terminal fancoil to water control valve and y terminal thermostat to fancoil for water control valve. B on a call for cooling the thermostat signals for the heating control valve to modulate toward the closed position. Check your outdoor unit for signs of water if the fan is still not turning on.

Study the wires inside the thermostat. If you aren t getting 24 volts between g and c then you might have a thermostat problem a thermostat wire problem or the low voltage fuse on the control board might be blown. As was the case with evaporator coil issues a condensing unit might have an excessively dirty coil or refrigerant leakage. Additional issues with the outdoor condensing unit might include a faulty compressor a failing condenser fan motor or a faulty run capacitor.

How chiller ahu rtu work working principle air handling unit rooftop unit hvac system duration. Thermostat equipment for fan coils and ahu s. A the fan coil unit is controlled by a unit mounted controller provided by mechanical systems controls contractor mscc. On a further call for cooling the thermostat signals for the fan to speed up from its.