Diagnostic Codes - Rinnai REP199i Installation And Operation Manual

5.6 Diagnostic Codes

To display diagnostic codes:
Turn off the water heater by pressing the "On/Off" button.
Press and hold the "On/Off" for 2 seconds and then the  (Up)
button simultaneously.
The last nine maintenance codes display and flash one after the
other.
To exit diagnostic codes and return the water heater to normal
operation, press and hold the "On/Off" button for 2 seconds and then
the  (Up) button simultaneously.
Turn on the water heater by pressing the "On/Off" button.
WARNING
Air Supply or Exhaust Blockage
10
• Ensure approved venting materials are
being used.
• Check that nothing is blocking the flue
inlet or exhaust.
• Check all vent components for proper
connections.
• Ensure vent length matches with the
vent lengths set in the parameter
settings.
• Verify High Altitude setting are set
properly.(See Parameter Setting)
• Check fan for blockage.
* See "Electrical Diagnostics" on Technical Data
Sheet located on inside front cover of water heater.
48
Some of the checks below should be performed by a trained and qualified
professional. Consumers should never attempt any action that they are
not qualified to perform.
Rinnai Tankless Water Heater Installation and Operation Manual
Figure 42
No Ignition (Heater Not Turning On)
1 1
• Check that the gas is turned on at the
water heater, meter, or propane cylinder.
• If the system is propane, make sure that
gas is in the tank.
• Bleed all air from the gas line
• Ensure appliance is properly grounded.
• Ensure gas type and pressure is
correct.
• Ensure gas line, meter, and/or regulator
is sized properly.
• Verify parameter setting are set
properly.
• Ensure igniter is operational.
• Check igniter wiring harness for
damage.
• Check gas solenoid valves for open
circuits.
• Ensure flame rod wire is connected.
• Check flame rod for carbon build-up.
• Remove burner cover and ensure
burners are properly seated.
• Remove burner plate; inspect burner
surface for condensation/debris.
• Check the ground wire for the PC board.