How do I test to see if my gas valve on my wall heater is working or not? Please don't respond and say call a pro.
I assume you mean the soleniod controlled valve. I also assume the pilot is lit, or the electronic ignitor glows (which ever it has) but the main burner doesn't lite. Use a test light (I prefer neon) or a meter to check the voltage to the soleniod. If the voltage never goes to 120, then there is something wrong upstream. If it does and the burner doesn't light, most likely the soleniod is bad. Also, you should hear it click when it opens and you should hear the gas.
There's a rubber diaphragm inside the water regulator it must be deforming cause of water condition . By changing that washer will start work. I recommend call a pro to do that.
Depends on what kind of wall heater. FOR A 24 volt system : you will need a ohm/volt meter to do that. Make sure the thermostat is calling for heat, and the gas going to the unit is on. you should have 24 volts at the gas valve. if there is 24 volts there, and the burners are not on, then the gas valve is bad. If you don't have 24 volts there, then your thermostat could be bad, and not turning on the gas valve, or you might not have control voltage. You should be familiar with basic electricity to do this.