I have a problem with my 45,000 BTU Hot Dawg heater, and I can't find anyone who can help. It is an older 102 model series
PROBLEM: When the heater comes on initally, the exhaust fan runs for a couple of minutes. The burners light and burn well. A short time later, the circulating fan comes on. So far, so good. Now, the heater will burn for a while, maybe even come up to where the thermostat is set, and then the burners go out. But the circulating fan continues to run, and will not shut off. To get the heater to light again, I have to shut the electric off to the heater and let it sit for maybe 1/2-3/4 of an hour. When I turn the electric back on to the unit. It repeats the same cycle.
WHAT I'VE DONE SO FAR: Called the service guy (because I don't know jack about this stuff). He checked the gas pressure before it lights and after it lights. All is good there. Replaced Terminal Board w/time delay relay (at Modine's suggestion). That didn't work. Contacted the factory sales rep. Was told that Modine is familiar with this problem and there is a problem with the wiring harness. They sent me one at no charge. Didn't work.
There's not a lot to these things. Somebody ought to know what's wrong. About the only other things to change is the gas valve (at nearly $200), the pressure switch ($55) or possibly the high limit switch ($30). The Terminal board was $70.00. I can buy a new heater for just over $350.
Has anyone else had a similar problem, or have any idea what the problem may be? I'm getting desperate here. I haven't been able to work in the wood shop all winter because I don't have any heat.
Thanks for any help you can offer.
Jim