Needing help with my H82 heater

154
4
18
Location
NW Missouri
Ive been using it for a few years now without issue, but the last week it’s delaying me fits. I can go through the startup procedure and get it to light off and make heat, but after cycles “off” and isn’t making heat it won’t go back to the heat cycle and ends with the dreaded alarm/safety release. Ive gone through the trouble shooting section of the TM I have, but it doesn't cover the issue I’m having.

I just sat and watched the pressure gauge as it was operating. It comes up to around 120 psi while it’s making heat and holds steady until it cycles off the heat cycle. The pressure drops down to normal and then jumps back up to 120 when the heat cycle starts up again. It runs for about 10 seconds and then I get the safety release.

I’ve got it inside my shop with the exhaust going through the wall. It’s too close for me to see if there is a flame through the inspection window. ( I don’t have an inspection mirror, but I’ll get one on my next trip into town. ). If I leave it on vent for 5 minutes and prime it with the S7 toggle switch it will light off and run again like I described above.

I’ve cleaned the fuel bowl, there was little to no sediment in it. I’ve gone over all the visible fuel lines, no leaks any where. Any pointers would be greatly appreciated. Thanks.
 

155mm

Chief and Indian
Steel Soldiers Supporter
1,101
221
63
Location
Guymon, OK
Yes, turn down fuel psi, its just wasting fuel, sending out the exhaust, you fuel economy will go up and you won’t notice any difference.

i am at 3100’ and run about 90 psi


did you read his thread?

 
154
4
18
Location
NW Missouri
thank you. I‘m around 500 feet so after reading the Tech manual on fuel pressure by altitude I didn’t pay much attention to adjusting fuel pressure down on my unit. I’ll do as you suggested, I do notice excess fuel burning at the exhaust.

yesterday I lost all fuel pressure. Today I’ll check the coupler between the pump and the fan motor and look for sediment/debris in the onboard fuel tank. The inline filter was ok and no moisture or junk was in the sediment bowl when the fuel pressure disappeared yesterday. I’ve become spoiled in a 60 degree shop and working in a t-shirt when it’s below 20 outside.
 
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