Paloma PH2-20R DVSN, Engineering Handbook

Page: 79 / 172

SVC 820-Tankless Gas Trouble Shooting Manual Page | 79
79
66 – Error Code Diagnostic Chart
NO
YES
YES
NO
Turn Remote Control OFF; unplug unit
and then ON again. Check DC voltage
across red and black wires on Molex
connector “B”:
8 – 16 DC VOLTS
Is the DC voltage
OK?
Attempt to operate unit again.
If the unit malfunctions due to an Error
Code 66:
Replace Control Board
Is the DC voltage
OK?
While Water Bypass Valve is operating (water is
flowing), check DC voltage across red and black wires
at Water Bypass Valve wiring harness:
8 – 16 DC VOLTS
Attempt to operate unit again. If the unit
malfunctions due to an Error Code 66:
Replace Water Bypass Valve
Attempt to operate unit again.
If the unit malfunctions due to an Error
Code 66:
Replace Control Board