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WCohn
WCohn, Construction Worker
Category: HVAC
Satisfied Customers: 511
Experience:  Been in contruction 18+years
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I just changed the flow switch on a laars endurance and now

Customer Question

I just changed the flow switch on a laars endurance and now it won't fire up.. getting an f3 code. Any help?
Submitted: 23 days ago.
Category: HVAC
Expert:  WCohn replied 23 days ago.

Hello, my name is ***** ***** I look forward to helping you!

Expert:  WCohn replied 23 days ago.

F3 code indicates a gas valve on without a call for heat.

Expert:  WCohn replied 23 days ago.

See here

Customer: replied 23 days ago.
I saw that, I opened the hot water at the sink and turned up the thermostat.... still nothing
Expert:  WCohn replied 23 days ago.

Test your relay for an open circuit

Customer: replied 23 days ago.
any other ideas? i bleed all the baseboard heaters.. pressure is up to 12 psi.. no Green led is coming on. I also replaced control board.
Expert:  WCohn replied 23 days ago.

I think you have wiring issues. That's what the troubleshooting flow chart is saying. Do you have a multi-meter?

Customer: replied 23 days ago.
i do
Expert:  WCohn replied 23 days ago.

I can not find a wiring diagram and I need to leave, but I'd check for loose connections and an open circuit at the relay. Especially anything plugging into the circuit board you replaced. Sorry I can't help you further, but I'd still appreciate a positive rating for what I was able to do.