My williams forshaire 435 top- vented wall furnace runs well for a short amount of time. The electronic pilot starts the burner and the fan come on shortly. Then the fan shuts off or burner shuts off. It will re-light and fan will re-start. It will continue this for quite ahwile with either fan shutting off or burner re-lighting until it eventually stays on until the desired temp is reached. The unit is propane fired and has a intermittent ignition (not standing pilot)
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they usually have a manual perazo ignitor simular to a gas barbeque.. put the gas valve on pilot, depend the knob and hold it, depends the igniter epeatly until the pilot litghs, hold the knob in when u see the pilot flame for about one m,inute , release the knob, the turn the knob to the "on" posistion
www.manualslib.com > Brands > Williams Manuals > Furnace > 2509622
2509622; 2539622; 2559622; 3509622; 3539622; 3559622; ... WHAT TO DO IF YOU SMELL GAS: ... Williams furnace co. direct-vent wall furnace owner's manual (24 pages) ... Caring for Your Furnace ............24-25 Locating Wall Furnace and Thermostat ........6-7 Learn how to keep your new Williams Furnace operating.
If it touched a grounded metal surface, it is possible, leave the wires hooked up at the furnace, pull the thermostat off of the wall, disconnect the 2 thermostat wires, and then twist them together, the furnace should fire, if it does, then the thermostat is shot. Replace the thermostat, usually when there is a short, it burns out the heat anticipator on the thermostat.
Dear Alex191: I am shocked and amazed that the Williams heater company is STILL knowingly and willingly selling faulty direct vent gas heaters. My problems took place in 1988! I bought a 30,000 BTU Williams DIRECT VENT from The Home Depot. I took the time to remove window sashes and run gas line to the Williams heater that I had placed in the window aperture. I was glad to finally have heat and be able to heat the area of the house where I stayed. Then I began to smell gas when the Williams was OFF. I traced it to the area where the pilot light gas tubing entered the combustion chamber. I removed the Williams unit and replaced it with an identical make and model and the SAME THING HAPPENED!!! I sat on my bed and almost cried. I had the gas company come out and they labled the problem as a "fuzz leak". The warranty repairman came out and had no idea what to do. Tightening the retaining nut did nothing. I called Williams and even back then they said that they were aware of the problem. They called me back and wanted to send me a part and asked me, "Can you work on it?" I returned the Williams and bought a Perfection-Schwank CONSOL heater that burns the air in the room and vents horizontally to a 4 inch vertical gas vent and was very satisfied with it. When they went out of business I bought an "Empire" brand gas heater. I don't know if I'll ever buy another direct vent heater from anyone. I will be glad to write an affidavit should you decide to suit the Williams company.
A couple thoughts. On some of the wall furnace gas valves there's a knob that you can set for low fire or high fire. If your valve has this make sure it is in the high fire setting. Is the wall furnace controlled by a wall thermostat or a knob on the heater? With the thermostat turned all the way up like to 90, does the burner and fan continue to run or is the burner short cycling. Is the fan clean and running up to speed. Some of the Williams wall furnace had a two speed fan motor so when the fan came on at first it would run on low speed. As the heat exchanger got hotter the internal fan switch would switch it to high speed. Outside of that you would need a monometer to check the manifold gas pressure.
I have a Williams top vent gravity wall furnace (model 5009622) and I had the same problem. I had to take the cover off the furnace -- screw on top and two at the bottom (open the access door and there is one screw on each side) to get to the reset button for the vent safety shutoff system. On my furnace it's on the left side toward the top of the unit. I pressed the little red reset button and it's been working ever since. If your furnace is properly installed and doesn't have bird's nest in the chimney, it should work fine. Good luck!