Error Code - Paloma PH2-20R OFN Engineering Handbook

60 | Page
31 – Error Code
Explanation:
Inlet Thermistor malfunction
1
Turn power OFF. Remove connector "R" on Control
Board. Measure resistance between Black #3 & white
#6 wires: 7K – 23K Ohms. IF OK, attempt to operate
unit again. IF 31 Error Code does NOT display, you had
Blower Motor
60
SVC 820 Tankless Gas Trouble Shooting Manual
INLET THERMISTOR DIAGNOSTICS:
a loose connection.
Molex Connectors
Diagnostic Checks:
• Inlet Thermistor
Control Board
Bottom of Unit
Turn power OFF. Remove 3 screws for Control Board
mounting bracket. Remove connectors "M", "T" &
"G". Pull Control Board out of way to access WHITE
Molex for Inlet Thermistor located near the Blower
3
Separate top and bottom of WHITE
Molex for the Inlet Thermistor. Top of
Molex has 2 black wires and 1 white
wire. Bottom of Molex has 2 white
wires. Continue to Diagnostic Chart
on next page.
Inlet Thermistor
2
Motor.
Screws