What's the voltage at the valve when this happens? What's inlet gas pressure?
Thank you for the reply. Unfortunately, this is beyond my toolbox. Perhaps this is a good time to call-in an expert in the field?What's the voltage at the valve when this happens? What's inlet gas pressure?
Thank you for the reply. If sticky gas valve, is this something I can clean/check (along with dirty burners)? I suspect if there is a problem with the exchanger, I would need to call-in an expert in the field.Could be an intermittently sticking gas valve, dirty burners, or a heat exchanger problem.
Thanks for the quick reply. I have a basic multimeter and feel relatively solid with electricity but have not done much with gas. I created a video a few weeks ago detailing my furnace along with some basic troubleshooting steps (I do this to help myself down the road if needed) ... the video can be found here:To troubleshoot you'll need tools, a decent multimeter at the least. Otherwise you'll just be guessing and blindly throwing random parts at the unit.
Troubleshooting can involve working with live gas and electricity. So you need to be ok with that.
Thank you ... what is the correct voltage?Using a multimeter you have to verify that you are getting the correct voltage at the gas valve... given the age of the furnace ir sounds like your gas valve is stuck closed and not opening to allow burners to start... if you have the correct voltage at the gas valve then your gas valve is bad... if you dont then you have to figure out why.
Heat went out last night. I hooked my multi-meter to the gas value and reset unit. When the unit when the switch was flipped, the multi-meter went from z to 1.4-1.6 which does not seem right. The gas came on and flames lit. I suspect I am doing something wrong.Is the gas valve getting voltage to open? If so is there gas pressure on the outlet side of the valve?
Don't want to guess and throw parts at the unit without knowing exactly what's wrong. You'll end up spending more $$$$ then if you just hired a professional technician.
After taking a closer look and retesting, I am getting 24-26 which seems solid.If the unit successfully lit, then the gas valve should have 24 V at the main valve terminals.
Most gas valves are not field serviceable, and say so on the valve itself. If this is the case the valve should never be dismantled. If it is it should never be used.If your going to listen to people telling you made up stuff like your gas valve is sticking then why would you even use it? Wiggle the white connector where the wires go into the gas valve when you know the gas should be coming. You'll hear clicking sounds coming from the gas valve. It may even light if you push it to one side. There are pins that the connector plug into. These pins are attached to a pcb. Most of the time the solder joints crack and don't make a good enough connection to the pcb. You can remove the black bracket of the gas valve and access the board. Re-flow the cracked joints and it will work without pause.
I agree. After confirming voltage, I decided to replace the gas valve. I hired someone to do the job as I have not worked with gas (outside of my grill). The valve was replaced today, and I will keep you posted. Thank you for your help and guidance ... much appreciated!Most gas valves are not field serviceable, and say so on the valve itself. If this is the case the valve should never be dismantled. If it is it should never be used.
The OP should verify its the gas valve with a meter and monometer before attempting to repair something he hasn't verified as defective yet.