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Old 11-08-2011, 08:58 AM   #15
Rivet Master
 
1981 31' Excella II
New Market , Alabama
Join Date: Sep 2011
Posts: 5,648
Well I am beggining to feel stupid. I think the problem is that there is a gas shutoff valve under the trailer that is in the off position. I won't know till I get home but that would explain a lot.

The sail switch is good. The control board is good. The thermal overheat switch is good. It looks like there is no gas supply. I seem to remember a valve in an odd place under the skin. I bet it is off.

I took the board to an electronics buddy of mine and we put it on the bench and it works just like it should. It sparks for a few seconds with the gas solenoid open and then it shuts everything down. The good thing is that I know it works like it is supposed to when I get it running.

So maybe all you nay sayers were worried about nothing. How many RV places would have just put a new one in there and charged me $1000 and grinned ear to ear the whole time.

Perry
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Old 11-08-2011, 07:34 PM   #16
Rivet Master
 
1981 31' Excella II
New Market , Alabama
Join Date: Sep 2011
Posts: 5,648
WARNING you are about gain knowledge of evil. Don't bite the apple or swallow the pill because you will never being the same. If you wish to stay in blissfull ignorance don't read further.

Well after putting the control board back in and still having problems the control board is flakey. I got it to start once. It is supposed to open the solenoid valve and run the sparker for several seconds and if it senses a signal from the sense lead that is the small wire next to the spark plug wire it continues to run otherwise it shuts down. The sense leads is not a thermocouple but a voltage source. When 12V goes to the gas solenoid it also sends 12V to the sense lead. The control card measures the current to ground and when it senses a current it keeps things running. Current flows when the air becomes ionized by the flame and becomes conductive. When mine started everything worked like it is supposed to and the fan ran while the furnace was hot even after turning the thermostat off as it should.

It appears that the circuit that tells it when to start is messed up. This circuit is supposed to wait a few mins after shutdown before it lets you start back up again.

The board is supposed to go through a cold start sequence as soon as the fan motor is up to speed and the sail switch closes and sends 12V to the card. There is also a thermal switch in series with the sail switch. The thermal switch is on the front face of the control board housing. I could measure 12V on the input of the control card but it would not initiate the start sequence.

Perry
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Old 11-10-2011, 06:31 AM   #17
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1981 31' Excella II
New Market , Alabama
Join Date: Sep 2011
Posts: 5,648
I bought a new control board locally and the furnance is now working properly. I hope the new electronics will be more reliable.

Perry
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