Fan Coil Unit Thermostat Not Working

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.

Fan coil unit thermostat not working.

Check your outdoor unit for signs of water if the fan is still not turning on. Study the wires inside the thermostat. 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 your system has frozen up turn off your thermostat for one to three hours to see if it unfreezes.

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. Thermostat equipment for fan coils and ahu s. 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.

The engineering mindset 659 350 views. Condensing unit not turning on at all. On a further call for cooling the thermostat signals for the fan to speed up from its. If it does not turn the furnace and air conditioner power back off again at the breaker panel.

I have further analyzed the wiring between the fan coil units and thermostats and it definitely looks like temporary stuff. How chiller ahu rtu work working principle air handling unit rooftop unit hvac system duration. 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.

As was the case with evaporator coil issues a condensing unit might have an excessively dirty coil or refrigerant leakage. Check under the unit and the cold exterior surface of the indoor coil enclosure. Test to make sure you are getting 24 to 28 volts ac between the g green and c com terminals on you fan center or control board. I want to connect the heat pump and fan coil unit not the electric heat to my generator panel and keep the electric heat on a different circuit how can this be done.