Question about Rinnai Digital Remote Water Heater Control Mcc-45-4us
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Posted on Jan 02, 2017
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
Its A Possibility The Left Over Water In The Hot Is Frozen. If Your Line Is Exposed Outside Somewhere It Can Easily Freeze Up. Turn On The Hot Water Everywhere In The House And If Accessible Check The Lines To See Where The Warmth Ends. You Can Leave One Off Over Night In Hopes That It Will Eventually Defrost.
Posted on Jan 16, 2009
My Paloma tankless water heater had a code of C7 - 76. I called the service center at 866-720-2076 and they stated this code showed a communication error between the Water Heater and the thermostat; they stated it was still under warrantee and they would replace it for free. Also, I found out there was a recall related to the door properly shutting. To make it work while waiting for the repair, I would turn off the thermostat, wait 2-3 minutes, and turn it back on. Usually it would work for enough time to shower.
Posted on Oct 06, 2010
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