Paloma PH2-20R OFN Engineering Handbook page 63

Check the resistance across 2 white wires
on bottom Molex:
7k – 23K Ohms
*High Efficiency (Condensing) Units ONLY:
Green wire & Green Molex
SVC 820-Tankless Gas Trouble Shooting Manual
32 – Error Code Diagnostic Chart
Is the resistance
to the Heat
Exchanger
Thermistor OK?
YES
Remove Molex from connector "R" at Control Board.
Check continuity from black #3 wire at Molex
connector "R" and black wire at Yellow* Molex
located behind Control Board. Check continuity from
Yellow* #5 wire at Molex connector "R" and Yellow*
wire at Yellow* Molex located behind Control Board
Is the continuity
across all wires
OK?
YES
Attempt to operate unit again.
If the unit malfunctions due to an Error Code 32:
Replace Control Board
Clean Scale Build-Up on Heat Exchanger
Thermistor. Retest Thermistor.
IF test OK, the water heater appears to be
NO
normal. Attempt to operate unit again.
IF resistance NOT OK:
Replace Heat Exchanger Thermistor
Replace wiring harness for Connector "R"
on Control Board
NO
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