Warning Code 10; Error Code 11 - Rheem RTG2-42 Troubleshooting Manual

Warning Code 10

Explanation: This is a warning code. Fan Motor is not creating enough ventilation. The venting
system passed pre-purge, but has failed during normal operation. At a minimum check the
following:
1. Check for blockage of heat exchanger fins.
2. Check heat exchanger flapper valve at vent connection of water heater moves freely.
3. Clean air intake filter.
4. Remove all obstructions. Check the vent termination on the outside of the building and
the flapper valve at the top of the heat exchanger.
This warning code is followed by failure Error Code 99.

Error Code 11

Explanation: No ignition. This error code can be cause one three different scenarios. Please
match the scenario to the fault condition before you troubleshoot. At a minimum check the
following in all cases:
7. Ensure you have gas to the appliance.
8. Bleed all air from gas lines.
9. Ensure appliance is properly grounded.
10. Ensure gas line, meter, and regulator are sized properly.
11. Ensure gas type and gas pressure to the machine is correct.
12. Flex lines with a full 3/4 inch inside diameter may also restrict fuel flow enough to give
you error code 11. We do not condone the use of flex line gas piping with tankless.
Scenario 1 – Error Code 11; fan is operating; igniter does not spark.
Does the igniter
have voltage?
Yes
Is the igniter
electrode clean?
Is the electrode
damaged? Is
wiring intact?
Yes
Replace Igniter Assembly
No
Replace Printed Circuit Board
Measure the voltage of connector H between both gray wires:
108 to 132 VAC.
You will need to cycle the unit to initiate an ignition attempt to
conduct this test.
No
Clean/replace igniter electrode.
Verify good ground.
Remove the burner cover plate to inspect the igniter.
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SVC 810 Tankless Troubleshooting Manual