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Old 12-10-2009, 09:14 PM   #1
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bad gas valve?


I tried to turn on the furnace but the thermostat sparks
it blew one thermostat so I tried another one and it sparked again.

I think either the coil or gas valve is bad

Is there a way to test the coil or gas valve to verify they are good and not shorted? is there a certain Ohms resistance to these parts?



This is a older honeywell controlled furnace with a gas valve automatic electronic pilot.

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Old 12-10-2009, 09:35 PM   #2
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bad gas valve?


where is it sparking if its the older type with a mercury bulb it will spark when merc flos to the other side and makes contact

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Old 12-10-2009, 09:36 PM   #3
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bad gas valve?


no its a digital generic type. I melted a lux that was junky too. both were digital.

It happened twice.
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Old 12-10-2009, 09:38 PM   #4
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bad gas valve?


when you switch to HEAT it will short the thermostat
I can switch to cooling and no problem
I can run the fan no problem

Its only the heat that shorts out the thermostat
it melted the switch wire on the lux thermostat
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Old 12-10-2009, 09:49 PM   #5
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bad gas valve?


if its a standing pilot furnace and the only thing the tstat is turning on is the gas valve than id agree with you its the valve
but if it is a newer furnace with draft motor its probably the circuit board
i didnt read enough of your post is there a circuit board? can you post a pic

Last edited by kennzz05; 12-10-2009 at 09:53 PM.
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Old 12-10-2009, 09:51 PM   #6
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bad gas valve?


yes its older, it has a gas valve.

is it possible the 24v coil is wired wrong?

I do not think so because the cooling works fine and so does the fan switch
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Old 12-10-2009, 10:10 PM   #7
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bad gas valve?


has anyone done any wireing changes or did this prob just start out of the blue any background knowledge is imperitive you could pull one wire off the valve and see if it sparks badly when attempting to reconnect it while the unit is calling for heat (jump red and white stat wires togeather to call for heat) but make sure wires on valve are disconnected or you will short out the transformer
so with the wires off the valve, touch red and white stat wires togeather,no big spark than the valve is the culprit its a process of elimenation
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Old 12-10-2009, 10:16 PM   #8
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bad gas valve?


does the coil have a 120v negative post ? i see positive going to the blower motor and the negative 120v going to one side of the coil. The fan works great without call for heat
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Old 12-10-2009, 10:18 PM   #9
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bad gas valve?


[quote=luvheat;364823]does the coil have a 120v negative post ? i see positive going to the blower motor and the negative 120v going to one side of the coil. The fan works great without call for heat[/quote


no only the fan is 120v gas valve is 24v
if youre getting 120 at tstat someone has f ed up your wireing

what is this coil youre referring to the gas valve has a coil but its internal are you talking about the spark control

Last edited by kennzz05; 12-10-2009 at 10:29 PM.
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Old 12-11-2009, 05:28 AM   #10
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bad gas valve?


Post pic of gas valve, and relay system for blower.
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Old 12-11-2009, 02:46 PM   #11
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bad gas valve?


I do not have a pic

I know the FAN operates at 120 volts and not 24volts

Does the 24v coil relay control the fan in any way?

I see white 120v going to the fan white

I see the blue fan wire going to the temp sensor for the Heater


Where does the 120v negative hookup? does it go to the 24v coil relay?
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Old 12-11-2009, 03:22 PM   #12
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bad gas valve?


Different voltages never us the same connection terminals.

A relay will control the fan.

Borrow a digital camera from a friend and post pics.
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Old 12-11-2009, 04:09 PM   #13
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bad gas valve?


is there any photos or diagrams available for the wiring of a 6 post blower relay *24v*?

I do not think the relay is wired correctly


It will take me a while to get a camera here
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Old 12-11-2009, 04:14 PM   #14
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bad gas valve?


I don't have one.

Was it replaced recently, that someone would have rewired it?
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Old 12-11-2009, 04:30 PM   #15
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bad gas valve?


yes, first sears fixed it but it broke the next day

then another company fixed it and it broke the next day

My friend told me the fan burned out the transformer and changed the fan and transformer

IT worked great during the summer for AC

but now its cold and the heater does not work

I think the 24v coil is miswired.

where do the 24v transformer wires go?
To the relay / thermostat wires? Does it go to R or Com? or the 24v coil?


I do not have any diagram for the wiring.


Last edited by luvheat; 12-11-2009 at 05:46 PM.
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