I installed a willieams 1403622 gas heater last year, and it operated fine. At the end of the winter season, the pilot valve and supply line valve were shut off. This year, when I turned on the supply line valve and pilot valve, then went through the pilot lighting sequence(several times for several minutes to let gas flow) the pilot would still not light. Any suggestions?
It's probably the thermocoupler. It went out several times on my Williams though it has been working for quite some time now. Anyway, the thermocoupler is the copper tube coming out next to the pilot knob. It goes into the furnace area and has a tip that hangs near the pilot light, measuring temperature and suchforth. Anyway, they go bad and the pilot won't stay lit. Make sure you get the right length (bring it in with you -- normally it's 18" but could be longer).
You may have already fixed this, but I hop this may be helpful.
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.
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If you mean that the pilot light does not stay lit, you could have a bad thermocouple or a loose connection at the gas valve. Make sure the flame is against the thermocouple. If you mean that the pilot won't light at all, bleed out the gas line a bit more.
You will need to replace thermocouple it's the small bulb in the pilot flame it has a copper tube that runs back to the gas valve here is a manual for that unit it shows the pilot head and thermocouple
Here is the installation manual that includes a section on how to light the pilot on your specified Furnace "Williams 1403622".
Let us know if this was helpful to you. Good Luck in your endeavor. :-)
There is a valve which you are bypassing when you press the pilot button. It is usually a sealed hydralic valve which holds the gas on as long as a flame is on the bulb. This expands the fluid and keeps the gas valve open. If the bulb moved and is not in the flame, or near enough, it will not stay on. Also since it sat for a year the internal workings of the valve could have "gummed" up. You need to replace the valve. You did not mention the name or model of the unit. Do a search with your units brand name followed by heater followed by parts. This should return dealers who can supply the part you need. Let me know if you need anymore help.
there should be an access panel on the bottom of the heater, it should open easily, don't force it,you'll see the gas valve on which is a knob, it says off, on, pilot,there also should be lighting instructions inside the panel, if not, find where you light the pilot, then find the pilot on, it will be a button on the valve or when you turn valve to pilot it will push in,now turn valve to pilot,lite pilot,push button/valve,hold 15 SEC
replace the thermocouple. it is a small copper tube that screws into the gas valve and goes to the pilot assembly. a good haedware store that sells heaters will have one. they come in various lengths 18"-48".
The pilot light could be dirty...which makes it smaller and thus takes a lot longer to heat the Powerpile ...the pilot should be BLUE not yellow or yellow tips and should fully envelop the Powerpile element in the pilot,,,if it looks small and dirty....try tapping it with a screwdriver...this loosens the dust and usually increases the size of the pilot....becareful to put the logs back in exactly the poosition described in the manual to eliminate Carbon buildup and a potentially dangerous condition
there could be something stuck in the pilot assembly since you added a new tank to system. Check to make sure flame is hitting thermalcouple. Can you wait for a repair man to come and take pilot assembly out and clean. He will also replace thermalcouple. If you can't wait and you feel comfortable with taking pilot assembly out. Turn gas and electric off to unit then pull cover panel off. Pilot assembly is held in with two screws. Take tube off of gas valve and take off thermalcouple line off gas valve too. take out pilot assebly. Once you have it out take gas line off bottom of pilot assembly. There is a orfice in side make sure you can see through the orfice. You can also clean thermalcouple with a wire brush or sand papper. Reinstall pilot assembly make sure all fittings are tight. turn gas back on and light pilot. If everything looks good turn power on. Turn heat up run heater for a few minutes then turn heater down and let sit to see if it will stay on.