High Pitched noise coming from Williams Wall Heater

I notice that some of my cell phone wall chargers make a high pitched ringing sound, not that loud though. I think cheaper internal electrical components are the culprit. (Opinion)

Where the pilot is unscrew pilot tube from pilot assembly and inside there it is

Check the flue, and supply vents and return air filter, obstruction of air is why unless you have a cracked exchanger.

Hello
The problem is with its backlight inverter board. there are some step-up transformeres [small ones] fitted on board. If any one's core bacome loose this fault will occur. Just open the TV and listen to which one makes hi-pitch noise. Replace it, if you can buy it from the electronic market at your town. In most cases, the inverter board needs replacement.
This board can locate on the right or left side of the panel, fitted vertically.
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The green knob does the flame adjustment. 1 is low and 9 is high.

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If you have a fan blower on your heater, it may be that the motor shaft is stuck and you're hearing the motor humming. Which, if it is, will burn out the motor.

Here's a link to the Williams website. There you can download the Owners Manual for your Model Number heater. There is a good Trouble Shooting Guide in it, which may also provide more info on what's causing the humming noise.

http://www.wfc-fc.com/

Hope this helps you solve the problem.

High pitched noise is from a very high CO2 level. Adjust the gas pressure to stay above 11" w.c. and have a gas technician with a calibrated CO2 analyzer adjust the CO2 levels.

call an assistance to your technician...

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.

The insert sounds like the cap covering the adjustment screw. Pin hole is for cap removal. Wondering why flame is so high?! Shouldn't have orange flame. If heater doesn't light with lower flame... thermocouple (thing that the flame heats up) may be bad.