I have a Slant / Fin Natural gas boiler. It is a Galaxy 100 Series model # GG-100 Hep. It has a Honeywell S8600M 1013 continuous re-try intermittent pilot module. Furance is 35 years old

The pilot will light, the spark stops, the main burner comes on sometimes it runs until room temp is met other times it goes off 15 to 22 seconds later and retries and retries and retries.

Cleaned the flame rod, check connections including ground. This helped for a while but the problem is back.

Next step would be?

 

After the main burner goes out, you are saying that the pilot won't even relight?

Are you getting 24VAC to the gas valve when this occurs?

35 years is a good long run for a gas valve... might be time...

I would double check the grounds... not just look at them, but remove them and clean them and reassemble. The signal from those flame rods is tiny, and any little bit of resistance in the ground connections can cause a problem.

If you don't have the manual for your ignition module, here is the PDF file:

http://customer.honeywell.com/TechLi...it/69-1954.pdf

 

The pilot relights each time, the spark stops each time and the main burner lights each time. It doesn't stay running for any length of time.

 

Do you have the manual for the boiler? Does it mention a "Rollout switch" ?

How long has it been since the boiler was serviced?

I'm thinking that maybe there is some partial blockage in the flue passes, and you are getting some rollout... and this is shutting down the burner... OR, it could be a defective safety device...

 

Yes I have a manual. No talk about a "rollout switch".

I have lived in the house for 9 years. I do the service checks as needed.

Last night I re-cleaned the ground wire connected to the gas control and the module. I also disconnected the main valve wire from the MV terminal on the gas control.

The pilot lit, it quite sparking and the pilot held for about 3 minutes. Good blue steady flame. Than lost pilot!! The pilot relit but kept sparking. Rotated the 90 degree boot on ignition cable and moved cable so it was not touching any metal. Spark quit and pilot held.

Reconnected MV wire between gas control and module. However I am still having the intermittent shut down and relighting of the pilot. Moving the ignition cable and rotating the boot seems to resolve the problem temporally.

Have not been able to separate the cable boot from the flame rod. I think it is suppose to come apart. I will buy an ignition cable today before trying to separate the two tonight.

Any suggestions on how to separate these two or other things I should be looking at?