20 Most Recent Williams 3501922 (NG) Gas Compact Heater Questions & Answers

you have to change the 2 leads on the motor should tell you on the schematic of motor how to do so. Most after market motors come with leads to go clockwise or countrclockwise depending on how the leads are wired

You may have a stuck gas valve. I would recommend replacing the gas valve. or have a qualified heating repair technician look at it for about $45. The price of replacing a gas valve by a heating repair company can rang from $300 to $450. The gas valve to a contractor cost $150. Find more heating repair pricing here.

sounds like you have a weak pilot flame clean out the pilot orifice

2 things i would check. low gas pressure and dirty burner. the pilot is lit so not to likely that is the problem.

I would suspect not. It's very, very rare for a control valve to go bad, unless someone tried to force it to urn with a pair of pliers or something similar.

If you have provided annual service to the heater, it's probably just residual gas remaining in the burners. To test this theory, turn the flames down to low and then turn the burner OFF. Do the burners and the pilot light go out? If it doesn't, you'll be that rare consumer that needs the Control Valve replaced.

Just to help you out a little bit more. I have provided a link to the Owners Manual for your heater. It's in a downloadable, printable, pdf format.

http://www.managemylife.com/mmh/lis_pdf/OWNM/L0408171.pdf

Hope this helps. Please let me know.

Rich

the pilot flame should sweep about 3/8" to 1/2" of the thermocouple. if this is happening then your thermocouple is bad and need to be replaced. pilot should be blue in color and be a sharp flame not lazy and yellow tipped

well having a service every year helps i would ask what they are going to do for 700 before they do anything I would think a burner would not cost that much

Hi,
The thermocouple is bad and you will have to replace it...
The thermocouple is the thing that sticks up in the flame to sense that the flame is on... if it goes bad the pilot flame will not stay lit when you release the button...

heatman101

Probable thermocouple failure. If the pilot light jet is visible, the thermocouple is located in the path of its flame. It could require adjustment if it isn't being reached by the flame during lighting but that is rarely the case.
Look for an object close to the end of the pilot light that is 1-2" long and ~ 1/4 inch in diameter. It will have a metal tube attached to the end farther away from the pilot light jet and is routed to the regulator.
The tube is part of the thermocouple so it is only screwed onto the regulator.
These are often easy to replace and if you take a picture of the pilot light end or remove the whole assembly, call a hardware store near you or a dealer in gas appliances to ask if they have a compatible one in stock. All of these devices produce the same voltage so only the physical dimensions are of an real importance. A shorter or longer end isn't critical but you may have to adjust the bracket holding the thermocouple so the new one is bathed in the flame of the pilot light.
The threaded fitting on the regulator end is rarely different so it shouldn't present a problem. The mounting itself is an electrical connection so don't break the brass fitting by over-tightening, there is no gas at that point.
Here are some photos of typical thermocouples:
Photos

You may have a bad themocouple. Its a probe that is in the pilot flames path. It converts heat from flame to a small electric current to open gas valve. Try to move it closer, clean it, or replace it. Also make sure the themocouple has been heated enough by flame to stay on.

bad 2 speed relay

Yes it sounds like it does. There should be no carbon monoxide in the environment. I am sure you know how dangerous CO is? Can your gas utility company or a registered gas technician to check it. The heat exchanger should be a replaceable part.

That probably means too much fuel or not enough air for correct combustion to take place. I would check its settings.

The switch you are talking about is called a roll-out or klixon high temperature limit switch. The over heating can due to a clogged flue vent, over firing from gas pressure being to high, etc. More information is needed like the model number, age, etc.

Hi, the next best thing to do would be to submit a quote to an hvac company and put a test valve that you've found within the quote. The company might then update you with the true replacement valve model if your valve is incorrect. Or you can reach out to a sell of your heating product on ebay and ask them if they can sell you that valve or any compatible replacement. Thank you.

Please, never bypass safety features. They are made to cycle and will still cycle if you bypass until it locks out on overheat.

As long as it functions to ur needs. Search utube or pinterest for maintenance videos. Ur library sec600 has repair manuals

have you had gas pressure checked?

When the main burner turns off, does it make a whoosh or pop? If so, this would be the issue causing the pilot to be disturbed. And have you tried to adjust the pilot/thermopile strength, if possible? A stronger pilot may help. Now if the main burner slowly goes out, and the pilot also slowly goes out, and also slow to ignite, and you've replaced about everything else, it may be the gas valve itself that has/is giving up. Gas is impure and causes a sticky residue. And if the main burner is "slow to act", this tells me the piston that's inside the valve is slowly opening or closing, and may be the reason the pilot is acting up. Make sure you check the outlet to your flue pipe also for obstructions. If the unit doesn't vent properly it can have more heat in the flue. That heat can have a downward rush when the burner goes out, kinda like forcing air through a clogged tube. And when you quit forcing the air, some of it comes back at you. Before condemning the valve try to check all else as you have done with the thermopile and such. Please work safe and I hope this helps.