Hope this helps..I have also attached a link that may be useful.
No Hot Water
REASON
REMEDY
No power
Check fuses or circuit breaker, replace or reset. Check with utility if necessary
Wrong wiring connections at heater terminal
Correct according to manufacturer's instructions
Leaks around heating elements
(1) Tighten element (2) If necessary, clean and replace with new gasket
Loose wiring connection
Locate loose connections. Clean carefully (remove all oxidation). Reconnect properly
Lightning
Inspect: (1) fuse (or circuit breaker). (2) Heater elements, and (3) thermostat, replace if necessary, see "grounding instructions" below
High voltage
Check utility for correction
Short
Locate short circuit and correct
Wrong piping connections
Reconnect pipes to proper fittings according to manufacturer's instructions
Undersize service wiring
Check with utility co. or electrician
Improper calibration
Replace thermostat
Faulty thermostat
Replace
Faulty thermal cutout
Replace
Open thermal cutout
Reset
Top heating element burned out
Replace
http://www.bradfordwhite.com/sites/default/files/product_literature/48494-A.pdf
SOURCE: Whirlpool energy smart water heater
Two flashes means that the high limit temperature has been reached. Once this happens, the temperature control system will shut off. Make sure that all element access doors are in place. Push the "Push to Reset" button to restart the temperature control system. The water heater will self test for ten minutes before it will start to heat. If you get the 2 flashes again then you may need to replace one or both elements. Each element should measure 5-25 ohms.
The "thermostat" is the knob marked "Temperature Control". Make sure that the operating mode is set to 1,2 or 3.
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: insinkerator hot water heater takes a long time to dispense water
It may have mineral deposit buildup on the inside. You will need to consult your maintenance manual to see how to flush the unit and clear it of deposits. You can also contact Insinkerator for the information as well. You can use vinegar to clean it just like you would a coffee pot. Take the inlet supply off and using a funnel pour the vinegar in and turn the unit on.
SOURCE: Noritz tankless water heater not producing hot water
I called Noritz error code 16 is a overheat problem. Noritz say's to flush your coil with vinegar or CLR.
Use a small pump to recirculate the CLR or vinegar through the system for 45 minutes and flush with fresh water. This worked for me.
SOURCE: how to correct error code C-7 on my RTG-74PVN Rheem Pronto
I had the same problem and called the manufacturer. The error code C-8 was followed by the number 76. They told me to disconnect the thermostat/digital display from the main unit. This was fairly simple to do by removing the front panel. The unit works steady now without shutting down after a few minutes. The help desk told me that the main circuit board needs to be replaced for the unit to work with the display and that they would mail me one asap. At least we have hot water again.
Oakville, Ontario
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