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Thank you I'll give it a try !!!

Thanks for the replies, I'll try taking the stack off and blowing out the inlet and yes it has good air flow the heater is about 10 years old and was working fine

I have an A O Smith 40 gal water heater power vent, The fan comes on but then I get an error code that pressure switch is not closing. I have jumped that switch and the burner starts up just fine. I have blown out the exhaust so there is no blockage. I have sucked on the switch hose and this...