Problem: My tempstar gas furnace seems to go through a normal start up, heat, shut down cycle but then it keeps trying to start up again and again and again. The flame never comes on when it goes through this post heating cycle, the small exhauster motor keeps starting up and shutting down after several seconds. A technician told me if I changed my Honeywell smart valve out (his charge ~ $500 !,) that the problem would go away. I see you sell this valve, model # SV 9500M 2603. I will buy the valve from you and replace the valve if you think that will cure the problem. Do you believe that is the problem?
Solution: I can not guarantee this is the problem. I would need to be there and test various furnace components with a meter to determine if it is the SmartValve. I would start with testing the thermostat to make sure it is getting a constant 24 to 28 volts between the W and C (com) wires when calling for heat. I would test all the safety controls, ie limit, pressure switch, rollout switches to make sure they are all staying closed. Is the draft inducer staying on? If not this could be a control board problem. The draft inducer should stay on when calling for heat. I hope you can get the problem figured out easily.