Error Code 12 - Rheem RTG2-42 Troubleshooting Manual

Error Code 12

Explanation: Flame Failure. Unit went to main burner for a period of time; but has since lost
flame or the ability to verify the presence of flame. At a minimum check the following in all
cases:
1. Bleed all air from gas lines.
2. Ensure appliance is properly grounded.
3. Ensure gas line, meter, and regulator are sized properly.
4. Ensure gas type and gas pressure to the machine is correct.
5. Flex lines with a full 3/4 inch inside diameter may also restrict fuel flow enough to give
you error code 11.
For convenience, the RTG 66 model has a ¼ inch inlet gas pressure check port
Does the unit
have proper
inlet gas
pressure?
Yes
Unit appears to be OK. Try to restart.
Is the burner
manifold
pressure
normal?
Yes
Check and inspect burner assembly, flame rods,
heat exchanger.
on the gas connection nipple.
No
Adjust inlet gas pressure based on fuel type.
Natural Gas: 4.0" to 10.5" w.c.
LP Gas: 8.0" to 14.0" w.c.
No
Adjust burner manifold pressure. See instructions
on page 39.
L.P. Gas Pressure
49
SVC 810 Tankless Troubleshooting Manual
Natural Gas Pressure