I have a Williams wall heater in a cabin I own. It starts fine. heats up just fine. Once the thermostat trips at the set temp, the heater does not come back on unless I shut it down and restart the process. The thermostat clicks as it should to come back on. have replaced the overtemp switch and the thermocouple.
Kent
A model number would be very helpful as most of the Williams wall heaters don't use a thermocouple.
They do use a thermopile or pilot generator. Pilot flame size is very important.
Is your unit like the picture ?
If not.... post a picture of yours...... How-to-insert-pictures.
That's a pilot generator or thermopile. It's a millivolt device and produces 500-700mv when heated.
If relies heavily on a proper pilot to generate enough voltage to keep the pilot valve open and to operate the main valve. You're going to need a voltmeter to troubleshoot the problem.
With thermostat OFF..... check from TH/TP to TP. This is the unloaded voltage level. (500-600mv)
With thermostat calling for heat.... check from TH/TP to TP. This is the loaded voltage level. (350mv)
Now check from TH/TP to TH. This measurement should match the previous measurement.
It will typically be lower. Subtract this measurement from the previous one. What is left is what you are losing thru your thermostat and wiring. If you have a loaded voltage of 350mv and a final measurement of 150mv.... you're losing 200mv thru the wiring.
These are DC voltage measurements under 1 volt.
The measurements came in at 400, 250 and 160. I took apart and cleaned the Pilot assembly. I did notice that there are two Honeywell thermostats that look alike, only one is for mv heaters. I got one and it was different from the one on the wall. everything works as advertised now.
thank you for the lesson.
Kent
Your thermopile is a little low. Could be aging or pilot.
The last two numbers should be even.
250mv is what the t'pile is producing under load.
160mv is what is actually getting to the gas valve. The difference is loss.
Can be caused by loose/corroded connections in the thermostat line.
Hello, the blower fan/motor assembly on this gas furnace has recently started making vibrating noises. It had never been exactly a quiet appliance but lately it's a bit louder. The blower wheel is covered with dust and also -- the axis of the wheel has got about 3/4" play or slack, meaning the wheel inside the metal enclosure can be shifted along the axis by that distance. This furnace is definitely in need of maintenance, so I wanted to see if it could be taken apart, at least the blower motor assembly.
Does anyone recognize the model of this furnace from the photos below? Would greatly appreciate any hint! Thank you and Best Wishes, h.
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Right now, I have a Lasko brand ceramic floor heater (~$120) that is smelling up the room and now is not turning on. It was just tipped over by my dog when he was playing. Now, keep in mind this is thing is only about 2 feet tall, and it doesn't seem like one tip over should put this thing completely out of commission like this.
This is the second Lasko space heater I've had in the last 3 months. The last one was a cheaper model that was tipped over that then began to spew smoke out of it.
Is there something I can get to on the inside to fix this easily? Or are ceramic heaters really just this fragile, and I shouldn't bother altogether?
01-27-21, 01:51 PM
