SVC 810 Tankless Troubleshooting Manual
51
g. If within 3 minutes, you get any reading, and then the reading drops below 8 mv,
and then goes to Ø, then we have a problem with the ODS, a missing sensor
damper or the burner itself. Replace the burner assembly.
What is the big different between normal error code 13 and no SD (Sensor Damper)? Normally
error code 13 is just low voltage or frequency; it means the ODS is still sensing a burner flame.
But if the SD is missing, there is no fire on ODS from the beginning of the main burner
operation.
Does ODS still generate voltage because main burner ON? Yes, but the voltage is much lower
than the PCB requires. You can verify this at cell ØA in maintenance mode.
Error Code 14
Explanation: Overheat Film Wrap has activated. There may be a hot spot on the heat exchanger
that has caused the overheat film wrap to fault. At a minimum check the following:
1. Check gas type of unit and ensure it matches gas type being used.
2. Check heat exchanger for cracks and/or separations.
3. Check for restrictions in airflow around unit and vent terminal.
4. Check for a foreign materials in exhaust venting.
5. Before checking resistance of Molex connections, remove the Molex from the circuit
board.
Re
lace the PCB
Reconnec
the Molex and restart the uni
.
Is the Molex
connector at
location U in
place?
o
Yes
Is the resistance
of connector U
OK?
Yes
No
Re
lace the uni
Measure the resistance of connector U between both
white wires: 50k - 500 k ohms
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