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An expert who has answered 20 questions.
Re: no hot surface igniter
This is why swapping parts is never a good idea. It could be a board, pressure switch, or several other issues. I'm a service technician and realize that many furnace issues are difficult to diagnose over the phone, or internet.
Calling a qualified, NATE certified technician to diagnose and repair this properly is probably the best solution that I could suggest. Yes, there will be a bill and it will be expensive, but it will be a lot less so than changing out parts you might not need.
a 6ya Repairman can help you resolve that issue over the phone in a minute or two.
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ignition failure. insure air pressure switch closes, hot surface igniter is getting 120volts. check continuity on hot surface igniter, make sure all gas shut off valves are open and gas valve is turned on. make sure there is no blockage in the exhaust
Sounds like either the flame sensor is not working.
The sequence for starting the furnace is:
1. extraction fan on
2. pressure sensor (for fan)
3. ignitor (spark or glow plug) comes on
4. gas valve opens up
5. ignition of flame
6. flame sensor (or temperature sensor)
7. plenum temp. sensor
8. main fan starts
It is most likely that the flame sensor is dirty or gone,
or (and I hope not), the module is gone and needs to
The entire igniter should glow, if it does not the temp to ignite the gas is not met and the burners will never light. When replacing the igniter never touch the element part becuae it will create a hot spot on the igniter and fail.
The problem is you're Gas valve. If you have a volt meter, set it above 24 volts ac.When the Hot surface ignition glows, have you're meter on your gas valve terminals. Hold them there through the complete cycle, and you should have 24volts which you will, showing with power going to it, it will not open, the coil is burned out. Do not try and repair it! This has to be replaced.When the Gas valve is ready to open, you will hear a click.No gas, bad coil.This will solve you're problem, I have replaced so many of the MGV's. Good Luck, and please let me know, Thanks Shastalaker7
the fan you hear come on at a call for heat is most likely just the inducer motor. the click you hear is probably the relay for the hot surface ignitor which should glow red, then in turn ignite the main burners. your going to have to determine if the ignitor is coming on. if it isnt the ignitor is bad and will need to be replaced. if it comes on and than shuts off after a few seconds the ifc board is probably at fault