My honeywell RTH230B won't do anything. I put fresh batteries in it, tried everything and nothing happens. What is the probelem and what can I do?

If this is a typical air handler unit then turn the fan switch to on, if the fan does not come on then you have a control problem or no power to unit. Check fuses/Breaker.



If fuses and breaker are ok then try this. Turn the power off to unit, try and locate control board usually

located in the lower panel where the blower might be.



Disconnect thermostat wires that go to probably

r/w/g/y/c and remember what color goes to where.

If you can make a jumper wire or you have aligator

clips, jumper r and w. Put door back on, turn power on and heat should start up.



You can also put a jumper between r ang g terminals

instead and the fan should come on.



If either of the two cases happen, then you need another thermostat or check wiring to thermostat.

Another possibility is that there could be a car fuse

located in the control board that is blown



Good Luck If this is a typical air handler unit then turn the fan switch to on, if the fan does not come on then you have a control problem or no power to unit. Check fuses/Breaker.

If fuses and breaker are ok then try this. Turn the power off to unit, try and locate control board usually
located in the lower panel where the blower might be.

Disconnect thermostat wires that go to probably
r/w/g/y/c and remember what color goes to where.
If you can make a jumper wire or you have aligator
clips, jumper r and w. Put door back on, turn power on and heat should start up.

You can also put a jumper between r ang g terminals
instead and the fan should come on.

If either of the two cases happen, then you need another thermostat or check wiring to thermostat.
Another possibility is that there could be a car fuse
located in the control board that is blown

Good Luck