Sometimes when running hot water the Rinnai tankless water heater periodically starts beeping and flashing code 25 and the water starts running cold. I take the drain tube and bend it different directions till water runs out, then it starts to get hot again.
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: No water flow from hot water tap with a rinnai tankless water hea
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.
SOURCE: BOSCH AQUASTAR 2400ES NATURAL GAS TANKLESS HOT WATER HEATER
Q.
FA - Gas leakage error, gas valve circuit not closing properly
A.
Q.
EA - No flame ionization detected with water flow
A.
Q.
C1 - Fan rotation too low on startup
A.
SOURCE: No hot water
The code # 11 is a code that warns of "no ignition" and the causes of this error code are too many to list. I would suggest that a qualified tech. perform a diagnostic test and repair.
This is not a task for the "do it yourselfer"
SOURCE: Paloma PTG 74PVN Tankless Water Heater
did you check the filters on the the water valves, i am not exactly sure about your codes that are shoeing but if you could read it and post them, i know on some of the units 76 means there is low water pressure and the filters are behind 2 caps one on each side above the shut off valve take off the caps and remove the screens, clean them and replace them ,, make sure you turn off the water on both side first or you will get wet
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