Question about Rinnai Webstone The isolator EXP tankless water heater Service Valves WRIK
My gas water heater won't fire up and flashes code 12 on the screen. I need a list of trouble codes to find out what this means.
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.
Posted on Dec 31, 2008
I have a rinnai tankless water heater
the gas valve has been replaced
the problem only occurs in the summer in the heat of the day
the heater shuts off and a code 12 appears
when the unit is turned off and then back on all is fine for a while
the unit sets inside the garage and is vented out the brick [horizonally] about 2'
Posted on Jul 30, 2009
Check your vent pipe to make sure air inlet side is clear and interior Metal piping is connected together thru out to prevent air discharge and air intake from cross contamination , this causes unit to function during slow flow rate ( lav ) but show 12 code during higher flow rate usage (tub ).
Posted on Jul 27, 2013
Check any other appliances that run on gas during that period...might have a problem with a regulator outside. Sometimes if they are exposed to direct sunlight, the metal inside can expand and stick. Usually they will hum occasionally when warm under heavy load
Posted on Sep 14, 2009
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