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I may have just got lucky.... I started tapping on all wire connections and the heater started to go off an on when tapping the "low temperature" switch located on top of the combustion blower housing....cleaned all the connections. The heater...so far...appears to be working properly...I even...

I have the pressure switch plugged in and the heater works now. Ohm testing shows the switch is always closed... so the heater runs... but it will not shut off via the thermostat...there is no thermostat control...trying both the new and old thermostat. Sorry if I didn't explain it clearly...

Thanks. So a faulty pressure switch could cause the thermostat not to react properly and keep the heater running when jumped?

Danpik I took every connection apart, cleaned them, blew out the burner assembly, cleaned the ignitor tip. I then jumped both high limit switches and the water pressure switch. The heater started up and kept running. One by one I reconnected the high limit switches... still worked. When I...

Jumped each of the limit switches...started up and ran for about 2 minutes....shut down...started up again ran around 30 seconds and shut down. Thanks for all the advice...is there anything I might check before worrying about a new control module or heater...pressure switch?

Danpik Jumped the thermostat as suggested... fired right up and ran for 1 1/2 minutes...shut down and after a few seconds started up again and quickly shut down. Guess the thermostat is secondary problem. Could a high limit switch cause this problem or anything else that comes to mind or is it...

Did the re solder job...2 appeared not to be making great contact...didnt make a difference... still shut down after 2 minutes. At least I checked one more possible cause off the list...thanks for the help. Thermostat will be here Monday. Hopefully that is it...I don't hear the clicking of the...

Danpik I am sort of an electronics geek...had a similar problem with the "eyes" on the garage door opener... basically cold loose solder joints. I will check out your suggestion. That photo looks like my board. I am still looking through old computer parts for motherboard standoffs to repair...

This heater - Hayward H series - H1001D1 / ABG 1001 - has worked well until a few days ago. It will ignite and run for about 1-2 minutes and shuts down. After 5-10 minutes I can start it again but will also shut off again. I took the thermostat unit apart because it no longer felt like there...