GOOD POWER TO THE GAS VALVE, BUT ONLY 1 OF 3 OF THE OUTPUT WIRES TO THE PILOT HAS POWER AND IT READS 18vac
If pilot wont stay light, possibly thermocouple may need replacement. Probably a service tech should come out, I do believe there should be 24 volts, not 18, but unit may be different.
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SOURCE: Pilot will not light
The Pilot indicator will appear to line up with the arrow on the base, and even push in as though allowing gas to flow, but if it is just 1mm out of alignment, no gas will flow. So the solution is to move the valve in the Pilot mode slightly in one direction or the other to see if/when gas flows.
SOURCE: cozy gravity one sided wall heater...pilot won't
how by extending the duct work will it make the gas valve work ?
if the pilotkeeps going out clean pilot jet , or if the power unit has gone in the gas valve then you would have to change the valve , don't get the flue bit ?
SOURCE: Carrier Furnace 58gs075-1 Circuit board issues...
I cant see your wire diagram but trace the circut your talking about. I believe it usually goes through a series of safety switches. Put your VOM across each individual switch. If you get 24 out from the board the first 1 you check and get 24v is open and not feeding back to the board is out. FIND out why. the switch could be bad but it may be indicating a more involved problem, just look aroeund for chared wires or tell tell signes of flame roll out or if its an open (fuse link) suspect what can cause an over heat condition anythign from a bad board or too long an off cycle before the indoor fan comes on ect. PONIT IS Once you come across the cause may not be the reason.
Please grade me accordingly and if you need more I need more info from you.
SOURCE: pilot light not working in gas heater
That probe that sits in the pilot flame is at fault. Remove and replace. Inexpensive fix. Make sure probe is in the tip of the pilot flame. If it does not stay hot enough, it will shut off the gas.
SOURCE: big old Hydro Therm boiler rolls out flame at
This may be normal it's hard to tell from your description , The flame could possibly rollout for a second or 2...depending on the venting , how far the vent is from the chimney etc....you shouldn't hear a "Mini Explosion" you may hear the gas ignite with a bit of a woooosh...depending on the size of the boiler this could be quite normal...Boilers can be dangerous when they get plugged up or dirty....although Hydrotherm makes an EXCELLENT Cast Iron Boiler...I would still have it checked by an expert to be on the safe side....you should also have a "Slow Opening" valve which would eliminate that problem if the valve is working correctly , but it's possible it was replaced at some point with a regular opening valve and this could be the reason as well
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The gas control valve is a Honeywell SV9501
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