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Yes thank you for your reply, it states: 3 Flashes Pressure switch failed closed before CAB is energized or failed open after CAB is energized. I'm starting to think should the diaphragm allow for vacuum into the soft rubber line when it is energized? Because when I blew into it, it would only...

Hiall, our new (2 years old) Mr Heater MHU50 garage heater stopped working. It is blinking 3 times. We tried to remove the white vacuum line going to the blower and use a paper clip (it seems to only go in as far as the ****** then stops against something metallic). Also when I try to put...