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Phil, Mechanical Engineer
Category: HVAC
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Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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I a Gibson/nordyne kg7tc060d 24b. Control board reads 1 hour

Customer Question

I a Gibson/nordyne kg7tc060d 24b. Control board reads 1 hour lockout. I reset the 2 resettable limit switches (not tripped).
Thermostat calls for heat- igniter glows- relays click- gas valve clicks- but burners don't fire
Submitted: 1 year ago.
Category: HVAC
Expert:  airheatman replied 1 year ago.

Do you have a meter to verify 24v at gas valve when you hear the click ? Also are you sure we have gas to furnace?

Customer: replied 1 year ago.
Gas supply is good. Yes, I have a multimeter, and am familiar with its use.
Customer: replied 1 year ago.
Should the limit switches indicate continuity?
Expert:  airheatman replied 1 year ago.

Yes limits should all show closed. but igniter should not light if limit is open. Lets check terminals on valve and make sure board is sending voltage to valve.

Expert:  airheatman replied 1 year ago.

Furnace always fires on high fire so check between C and HI terminals

Customer: replied 1 year ago.
Where are these terminals located?
Expert:  airheatman replied 1 year ago.

On side of gas valve.See below

Expert:  airheatman replied 1 year ago.

We should get 24v here when igniter glows and you hear the click

Customer: replied 1 year ago.
My situation is this. The furnace is located in an area with no cell service. So let me ask for a couple of possible solutions. If I get 24 V across the terminals, does this indicate bad gas valve? If I don't get 24 V across terminals, what is the solution?
Customer: replied 1 year ago.
Would it not be rare for the gas valve to have gone bad?
Customer: replied 1 year ago.
Furnace is only 1 1/2 years old.
Expert:  airheatman replied 1 year ago.

. If you are 100 per cent sure we have good pressure to valve and get 24v , valve is bad. If not, most likely connections or bad board.These valves do fail although they are not as frequent as other parts.

Customer: replied 1 year ago.
Furnace has been converted to LP gas, and been operating flawlessly for a year and a half. Is there a simple way to verify pressure at the valve (loosen gas connection and listen?) without having a water column indicator or other expensive tools?
Expert:  airheatman replied 1 year ago.

You would need either a manometer or pressure gauge.Just because we have some gas does not verify the necessary 11 to 14" needed .If valve is opening you should at least get a faint smell though even if not enough to ignite.

Customer: replied 1 year ago.
Why would it be different than a week ago?
Expert:  airheatman replied 1 year ago.

That is a hard question to answer.Sort of like asking why a light bulb worked last time it was turned on but doesn't now. Parts fail. Things change.Our first step is to determine if we are getting the voltage to the valve and then if we have proper pressure into valve.

If no 24v, board may be failing, if voltage but insufficient pressure a regulator may be failing and if 24v and good pressure, valve is failing.

Customer: replied 1 year ago.
OK. I'm going to take a drive out there and see what I can do. Thanks.
Expert:  airheatman replied 1 year ago.

Let me know what you find.

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