Do you have a p/n for a flame failure device not work/gas valve for a williams uniflow recessed gas wall heater model 57DW?

have you had gas pressure checked?

This would be the flame failure device not work / gas valve .

Try National energy web page

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

The thermocouple is not working correctly. sometimes you can clean the soot build up from it and it will work again. sometimes they just need replacing. the thermocouple is what the pilot light flame heats up when you turn on the heater. when the thermocouple gets hot it sends a 20 to 60 millivolt signal to the gas valve to activate the gas flow to the main burner.

This heater has 2 type gas valves one valve has the thermostat built into it. No wiring needed for that puppy. Looks like this:



So I am guessing that one ain't you.
Your heater must use a millivolt gas valve with the 2 wire wall thermostat. The pilot generator does 2 things. It holds the pilot on and it produces voltages that operate the solenoid and open and close the valve when the room thermostat makes contacts. So what goes wrong with these? The pilot generator will sometimes hold the pilot flame but whn the 2 wires are touched together or you tun on the wall thermostat the whole thang just dies. That my friend is a weak thermopile generator. The other thang that goes wrong is the solenoid on the gas valve is open and therefore the gas won't come on. Their is also a fuse mounted on there that melts and kills the magnet that the generator holds in for the pilot.

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Hi,
The thermocouple is bad and needs to be replaced...

the thermocouple is the copper rod that sticks up into the flame and then goes to the gas valve... this is what tells the gas valve that the flame is lit...
They are sold in many hardwares or HVAC supply houses...
They are also sold by length, so measure the old one before going to buy a new one...

heatman101

Hi,
The thermocouple is bad and needs to be replaced...
The thermocouple is the copper rod that sticks up into the pilot flame and then screws into the gas valve...
they are sold by lentgh so you need to measure the old one when you go to buy a replacement...

heatman101

First, turn off the gas valve for at least 5 min and ventilate the room. Most wall heaters are lit the same as a water heater. Find a red button to push or turn the gas valve knob to the pilot position. While pressing the red button or the gas valve knob, hold a match to light the pilot flame. After it lights continue holding the knob for one or two minutes. If the flame goes out when you release the knob the thermocouple is probably bad.

i'm having the same problems.......................