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Question About Weil-McLain Boiler HE (Series 3)
GAS VALVE...

GAS VALVE WILL NOT OPEN EVERY TIME, SO LIGHTING WILL NOT HAPPEN. MAY WORK FOR DAYS THEN WILL NOT WORK. MY TEMP. FIX IS TURN OFF AND ON UNTILL I GET IT TO OPEN. THANKS, MIKE

Asked by mike on 01/27/2009 3  Answers

ManualsOnline posted an answer 15 years, 8 months ago

The ManualsOnline team has found the manual for this product! We hope it helps solve your problem. Get the Manual Here

Chris posted an answer 14 years, 5 months ago

0 My Weil-McLain HE-5 Series 3 propane boiler's gas valve (White Rodgers Model 36C74 Type 227) fails too, in six months the valve has failed (at first intermittently), and been replaced, three times, and now the newest one is failing again. Service has shown good input gas pressure (~11WC), good output pressure (when it works) at ~10WC, 24VAC on the inputs for seven seconds even when the valve fails to open, and zero pressure output when the valve fails (24VAC applied). Help! April 26, 2010
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Chris posted an answer 14 years, 5 months ago

0 I posted the last comment of April 26, 2010. I found the problem by calling Weil-McLain tech support at (800) 526-6636. Turns out I have Taco zone valves, and an isolating relay is needed between the zone valve circuit and the boiler "start" terminals. Without the isolating relay, the gas valve was burning out, support said the transformer can also fail in that situation as well. Furnace running fine with isolating relay installed and new gas valve. Will keep you posted. May 5, 2010.
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