honeywell smart valve troubleshooting

Old 12-10-08, 06:25 PM
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honeywell smart valve troubleshooting

I have a rooftop HVAC unit with a smart valve SV 9500 M.
I have replaced that flame sensor - pilot assy with no results. When t'stat calls for heat, inducer motor starts and the pilot then lights. The main burrner does not come on. Am I right thinking the valve is the problem. If any safety device is open, the pilot would not light, isn't that right. I hate to just replace parts. Thanks
Old 12-10-08, 06:30 PM
Join Date: Dec 2004
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Try wiggling the wires on top of the valve. The 9500 had an internal wiring problem. If it comes on by this method then you do need a new valve

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