Paloma PH2-20R DVSN, Engineering Handbook

Page: 87 / 172

SVC 820-Tankless Gas Trouble Shooting Manual Page | 87
87
79 – Error Code Diagnostic Chart
YES NO
NO
YES
YES
NO
Test DC voltage across black and red
wires on Molex connector “G”:
144 – 192 DC VOLTS
Is the DC voltage
OK?
Remove and reinsert connector “G”.
Attempt to operate unit again.
IF the unit malfunctions due to an Error
Code 79:
Replace Control Board
Is the DC voltage
OK?
Press and hold down “MAX” button on Control Board
to activate Blower Motor. While Blower is running,
test DC voltage across black and white wires on Molex
connector “G”:
12 – 18 DC VOLTS
Press and hold down “MAX” button on Control Board
to activate Blower Motor. While Blower is running,
test DC voltage across black and blue wires on Molex
connector “G”:
4 – 10 DC VOLTS
Remove and reinsert connector “G”.
Attempt to operate unit again.
If the unit malfunctions due to an Error
Code 79:
Replace Control Board
Is the DC voltage
OK?
Replace Blower Motor Attempt to operate unit again.
If the unit malfunctions due to an Error
Code 79:
Replace Control Board