Heatilator Model CD4236IR-C

[Shumax]

This unit is in our home, which is about 8 years old. It's installed with a wall switch and has worked well until now.

I have gas as the pilot light is on. When I turn the switch on, I can hear it 'clicking' as it tries to start. I looked near the pilot light and I can 'see' the sparking occur, too. Every once in a while, it will start and run for a bit, but the flame is weak. It will run for a bit and then shut off and then click for a bit and come back on. That cycle will occur 2-3 times within a 3-5min. period and then it stops, completely. It won't start again. I have to wait an hour, or more, and try it again. During this time, the pilot light stays on; it will 'click' trying to light and I can see the spark - but, it will not light. I did reset the control module with no impact.

I'm mechanically inclined; just not sure where to start. I thought it might not be getting enough gas, but my furnace and water heater are working fine. I looked at the gas line coming to this unit and it appears fine - no kinks, that I can see, etc.

Hate to call someone in as I am sure I can figure it out with some direction. Thanks!

 

[DAKSY]

Sounds like you need a new thermopile, but I
can't be sure without seeing the pilot assembly.
Can you take a pic & post it?

 

[Shumax]

Well, I just took it apart and used some steel wool to clean up the prongs on the ignitor - I think that's what it was? I also cleaned out the jets with some compressed air. Put it back together and it seems to be working now...!

 

[Hillview45]

Shumax

I have the same model as you. When I turn it on, it beeps and then the pilot light comes on as normal with a strong blue flame. However the main burner never lights anymore. Is this similar to the issue you had?