Exhaust Vent cover blows off

Exhaust Vent cover blows off

by Matt
(Danville, NH, USA)

At times, only when turning on the shower the exhaust vent cover will blow off under extreme pressure (Both intake and exhaust vented to outside wall). Propane tank-less water heater. Used also for forced hot water heating of home. No blockage in exhaust piping and it has done this from the start. I suspect something in the installation as this is not all that old. I also wonder if the igniter is tripping on too late (long delay) and it's allowing too much gas to get in before igniting? Have you ever heard of anything like this happening before? If so I would be very interested in what was causing the problem.

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