Upon firing up the water heater makes a very loud humming noise
SOURCE: Rinnai tankless water heater code 12
12 - Flame Failure or Poor Ground
1. Immediate code 12 is usually a defective gas valve, power supply problem, or defective fan motor wiring harness.
2. If code 12 occurs after a few seconds it indicates that proper operation was established, but then stopped unexpectedly.
3. Verify that fuel is being supplied to the unit.
4. Check for proper electrical ground. Unit must use a grounded power supply.
5. Check for flue blockage on inlet or exhaust.
http://www.foreverhotwater.com/service-codes.php
SOURCE: humming noise with my beckett burner
the beat i can do on this is an educated guess , it would be the pump or the pump motor bearings , but having said that i have also seen these make noise for years and not go out ,I have worked on oil burner about 35 years experience has taught me not to guess parts , so the advise i would give is to find the part and model numbers for the motor on the pump assembly and the pump try to find availability in your area , heating and cooling, hardware store ECT. and wait to see if becomes more defined or fails so you don't spend a fortune on parts you don't need ,**** make sure there are no oil ports on the pump motor bearings 9LITTLE OIL CAPS ECT OR PLASTIC PLUGS YOU CAN REMOVE TO OIL ) IF THERE IS PUT A COUPLE DROPS OF 3 IN 1 OIL AND SEE IF IT HELPS .
SOURCE: my r85 rinnai water heater vibrates significantly and makes
Sounds like there is something loose in the line.Like cut off valve,check valve.
SOURCE: AO Smith water heater won't fire.
I bet your thermo couple is bad or your ports are clogged? How old is the unit?
SOURCE: gas smell during startup of GE hot water heater
yes, provided there is no excessive build up. The gas and air mix must be right before the mixture will ignit. a household stove will do this each time it's turned on. That's why yhe igniter sparkk hits about three times before it lights. proper venting will confine any fumes to the cimbustion chamber to be carried out the exhaust. If the odor is strong then have the appliance checked for safety sake.
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