I have a Goodman Air Handler AH2429 and the heating furnace won't shut-off.

When I disconnect the red wire from the furnace leading to the thermostat the furnace shuts-off and when I reconnected the wire, the furnace heat turns on (runs). I also checked the thermostat wiring - red to Rh, yellow to yellow, blue to blue and white to white. I have a honeywell RTH230B thermostat.

I guess that I have a faulty time relay? Am I right?

Please help me... my sincerest thanks...

When I disconnect the red wire from the furnace leading to the thermostat the furnace shuts-off and when I reconnected the wire, the furnace heat turns on (runs).

You are doing what the thermostat should be doing.

It could be

Low voltage wiring shorted between the furnace and thermostat.

Defective thermostat causing a call for heat all the time.

Quote:

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Originally Posted by hvac1000

When I disconnect the red wire from the furnace leading to the thermostat the furnace shuts-off and when I reconnected the wire, the furnace heat turns on (runs).

You are doing what the thermostat should be doing.

It could be

Low voltage wiring shorted between the furnace and thermostat.

Defective thermostat causing a call for heat all the time.

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HVAC1000,

Does your answer has two probabilities: one is I have a faulty time relay and the other, my thermostat is defective? Please answer back...

Here are the two answers.

(1)Low voltage wiring shorted between the furnace and thermostat.

(2)Defective thermostat causing a call for heat all the time.

These answers were based upon your action taken with the connect and disconnect of the red wire at the furnace. I have no idea where you got a defective time delay from?

If the thermostat is not calling for heat and you connect and disconnect the red thermostat wire you are acting like a substitute thermostat working the furnace. This would lead one to believe that the problem is as I mentioned in number 1 or 2 above. It could be other items but I would check those first using normal diagnostic tools.