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My gas furnace won't ignite?
I have a Honeywell gas furnace. Electrically, everything works fine. However, for some reason gas will not flow. It has a version of a Honeywell SmartValve (the schmatic says it is a SV9500 but it's older, and the newer version online doesn't look like mine--similar, but not exact). Is it possible that the valve is defective? Like I said, this is an older model. I've already replaced the blower motor successfully, though if it is the valve/ignitor assembly, I'm hesitant to mess with gas. I've checked the gas hot water heater and it has a lit pilot, so the gas is working. I'd love to replace the entire unit but the bucks aren't there.
4 Answers
- 1 decade agoFavorite Answer
Through my experience as a HVAC tec Smart Valves aren't always smart, ive replaced a lot of them. If everything is working "electrically" correct you should hear the gas valve at least "click" when it should start to be pumping gas. My only concern before condemning the gas valve is that its getting power from the board. Most likely its that valve.
Gas is definitely intimidating, and you should do your research if your questionable about the Smartvalve, key terms like "slow opening" or "standard opening" needs to be addressed too so u buy the right one. not sure where you live but with a service call and the repair your probably looking at around 500 bucks.
- Anonymous1 decade ago
Without looking at it and running a diagnostic I can't say for sure where your problem is. Start with the cheap easy fixes. Make sure all electrical connections are clean and tight. Make sure electricity is reaching the unit. It sounds like a solenoid isn't receiving the signal to open the gas supply. An HVAC man is your best bet.
- 5 years ago
Furnace cycling is most often caused by poor air flow, which is most often caused by a dirty filter. Could also be the fan/motor belt or the high limit switch.
