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Rick, HVAC Supervisor
Category: HVAC
Satisfied Customers: 22040
Experience:  40+ yrs. experience as a licensed oil & gas technician.
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I just had a Rheem Platinum 40 gal gas heater installed. It

Customer Question

I just had a Rheem Platinum 40 gal gas heater installed. It worked fine for a day and a half . Now there is no hot water. The green light is blinking 3x, saying pressure relief valve open.
Submitted: 2 years ago.
Category: HVAC
Expert:  Rick replied 2 years ago.

That error indicates the draft pressure switch is open not the relief valve. The first thing to check is to see if the flue/exhaust is blocked. It's also possible that the vent piping run is too long and the pipe size is too small since this is a new install.