Paloma PH2-20R DVSN, Engineering Handbook

Page: 60 / 172

60 | Page SVC 820 Tankless Gas Trouble Shooting Manual
60
31 – Error Code
Explanation:
Inlet Thermistor malfunction
Diagnostic Checks:
•
Inlet Thermistor
INLET THERMISTOR DIAGNOSTICS:
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
Motor.
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
a loose connection.
1
2
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.
Screws
Bottom of Unit
Control Board
Blower Motor
Molex Connectors
Inlet Thermistor