Fan Coil Unit Thermostat Not Working

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.

Fan coil unit thermostat not working.

If your system has frozen up turn off your thermostat for one to three hours to see if it unfreezes. Additional issues with the outdoor condensing unit might include a faulty compressor a failing condenser fan motor or a faulty run capacitor. 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. B on a call for cooling the thermostat signals for the heating control valve to modulate toward the closed position.

I have further analyzed the wiring between the fan coil units and thermostats and it definitely looks like temporary stuff. 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. Now the blower and heat pump should operate but the electric heat will only start when the power is available via the separate.

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. A the fan coil unit is controlled by a unit mounted controller provided by mechanical systems controls contractor mscc. If it does not turn the furnace and air conditioner power back off again at the breaker panel. Choose the red and white wires if you are having problems with.

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. 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. On a further call for cooling the thermostat signals for the fan to speed up from its. Study the wires inside the thermostat.

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