Heater does not relight

[Snufy1]

My Suburban NT-30M Heater Lights runs runs fine turns off at the preset temperature. The fan comes back on when temperature drops below but dose not relight.

If I turn the switch on the thermostat off and on without waiting just off/on it relights and runs fine.

Any Ideas?

[Daveh]

Here is something to consider:

 

Furnace Runs for One Cycle but Won’t Restart The typical cause is a blockage in the Combustion Air Intake or Exhaust, resulting in a lack of air into or out of the combustion chamber. Look for spider webs, dauber nests, debris in the air inlet and exhaust. It may also be caused by an inadequate gas supply, e.g. low gas pressure or a partially open Gas Valve. See Propane Gas Pressure. Gary Brinck – RVForum.net 3/14/2008 Page

 

Here is link to entire article. dave http://www.rvforum.net/miscfiles/Furnace_Trouble-2.pdf

[Trucken]

When it comes back on can you hear the arcing of the igniter. When it doesn't relight does the blower run then shut off on its own!!

 

If it does there are other problems, sail switch, blocked air flow, over heat sensor, low gas pressure, ignition problems, or theromestat

 

Sounds like circuit board, when you manually turn off and on it works..do you have access to the circuit board? If so there MIGHT be a light that gives codes to cause of failure..

 

 

Trucken

[Kirk W]

I suggest that you start by downloading a copy of the Suburban service manual from Bryant RV Service. There are several possibilities in addition to those previously mentioned. It could also be an igniter probe that has a cracked ceramic insulator which works fine when cold but shorts out the spark voltage once it is hot. Time to get your volt/ohm meter out and do some trouble shooting.

[Snufy1]

Thanks there was some debris in the exhaust cleaned it out and it now comes back on and relights. I tried it 3 times no problem. I'll keep an eye on it.

 

Kirk I will download that manual and check into it deeper thank you for the link