Question about Williams 2509612 Ceramic Mid-Size Heater

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Pilot light on but heater won't come on when I turn up the thermostat

I'm wondering if it has something to do with the electric ignition. We've only had the heater a few months and it just stopped working this weekend. With our previous heater we were able to have heat even of the electricity went out.

Thanks for your help, Janice

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Re: pilot light on but heater won't come on when I turn...

Williams heaters have a manual reset for the spill safety switch. If the heater is not venting properly it will trip this switch and shut off main burner function. The switch is on the left side of the cover inside the small vent. You can use a screwdriver to push the button back in. If the heater then works you will need to get the vent inspected to make sure it is connected properly and there is no blockage.

Posted on Jan 03, 2008

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Re: pilot light on but heater won't come on when I turn...

The heater obviously uses a standing pilot. in the pilot flame is a copper tube. this is a millivolt generator and is used to sense a lit pilot. it is a small dc generator that is connected to the pilot light valve. its function is to create a small voltage to energize a small electromagnet inside the main valve/pilot valve. when there is sufficient voltage present, it pulls in a magnet connected to a very small valve in the pilot gas line. this keeps the pilot valve open. when the flame sensor malfunctions you will get a pilot flame but when you release the button the flame goes out. replace the flame sensor and you should be back in business.

Posted on Dec 07, 2007

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the pilot light is off but I'm not sure if it's suppose to be while not running.I've tried priming it with three pumps, resetting by unplugging, beleeding the line, all don't work.
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When I turn on the heater, sometimes it comes on and sometimes it doesn't. The pilot remains lit. The repair person ruled out gas problems. Then he said it was the Thermostat but ruled that out and...

It sounds like your problem is delayed ignition.

This can be caused by low pilot flame height (Clean the pilot orifice or increase the pilot gas flow if necessary, by adjusting at combination control valve). Or the burner ports near the pilot flame are clogged and need cleaning. But, don't enlarge the holes. Low gas pressure can also cause this, but your repair person already ruled this out. If you have a wall thermostat, the Thermopile or Pilot Generator (it's the same thing) may be weak and failing. It's not generating enough millivolts of electricity to open the gas valve, when the thermostat is turned up. Or the Pilot Flame is not always touching it. If it is the Pilot Generator, the Cozy Part # is 70098 and cost around $40.00. A talented service man can install it easily.

Generally, these are the first things that you troubleshoot for delayed ignition.
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My empire wall furnace does not ignite. It has gas flowing because the pilot is light, i have changed the thermostat and wired it two different ways in case I reversed them. What is next? Could it be the...

It could be several things: Is the Control Knob turned from Pilot to ON? If that is the case, wait a few minutes after turning it to ON. That will allow the Thermopile to heat up sufficiently. Be sure the flame is touching the Thermopile. If everything looks correct turn up your Thermostat to higher than the ambient room temperature and see if the burners light. Remember to turn your Wall Thermostat down to the lowest temperature setting before turning the knob from Pilot to ON.

FYI - That Wall Furnace does not have a Thermocouple. It uses a Thermopile instead to generate millivolts of electricity to open the gas valve and maintain the pilot flame.

If it is the Thermopile, you can order it directly from Empire Comfort Systems, as well as download your Owners Manual at

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