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When you bypassed the air safety switch you proved it was not closing. This really tells you, either the switch or the blower motor has a problem. If the exhaust pipe or air side is blocked or the rubber air line is off the blower you will have no fuel pump. If the switch is bad you will have no fuel pump. In the 13 years of servicing these heaters I have never sold one Air Safety Switch. They just never fail. People have hooked them up wrong, the hose has come off and the blower motor has caused the problem. It is not likely two Monitor 2200 heaters would have an air safety switch problems. Since you have had two heaters with the same problem I think you have an air or exhaust problem. It is not unheard of to have hooked the air and exhaust up backward. As of this post you have not mentioned looking at the exhaust, inside and out.
Keep us posted,
Tom
When you bypassed the air safety switch you proved it was not closing. This really tells you, either the switch or the blower motor has a problem. If the exhaust pipe or air side is blocked or the rubber air line is off the blower you will have no fuel pump. If the switch is bad you will have no fuel pump. In the 13 years of servicing these heaters I have never sold one Air Safety Switch. They just never fail. People have hooked them up wrong, the hose has come off and the blower motor has caused the problem. It is not likely two Monitor 2200 heaters would have an air safety switch problems. Since you have had two heaters with the same problem I think you have an air or exhaust problem. It is not unheard of to have hooked the air and exhaust up backward. As of this post you have not mentioned looking at the exhaust, inside and out.
Keep us posted,
Tom
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