Paloma PH2-20R OFN Engineering Handbook page 81

SVC 820-Tankless Gas Trouble Shooting Manual Page | 81
71 – Error Code Diagnostic Chart
Attempt to operate again.
While unit is attempting to go to ignite,
Is the DC voltage
If the unit malfunctions due to an Error
check DC voltage across yellow and black
OK?
NO
Code 71:
wires on Molex connector "K":
Replace Control Board
75 – 100 DC VOLTS
YES
Reset the water heater and attempt to operate again.
If the unit malfunctions due to an Error Code 71:
Replace Gas Control Valve
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