Paloma PH2-20R DVSN, Engineering Handbook

Page: 62 / 172

62 | Page SVC 820 Tankless Gas Trouble Shooting Manual
62
32 – Error Code
Explanation:
Heat Exchanger Thermistor malfunction
Diagnostic Checks:
•
Heat Exchanger Thermistor
HEAT EXHCANGER 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 YELLOW*
Molex for Heat Exchanger Thermistor located near the
Blower Motor.
Turn power OFF. Remove connector “R” on Control
Board. Measure resistance between Black #3 & Yellow
#5 wires: 7K – 23K Ohms. IF OK, attempt to operate
unit again. IF 32 Error Code does NOT display, unit
had a loose connection.
1
2
3
Separate top and bottom of YELLOW*
Molex for Heat Exchanger Thermistor.
Top of Molex has 2 black wires and 1
yellow* wire. Bottom of Molex has 2
white wires. Continue to Diagnostic
Chart on next page.
Screws
Bottom of Unit
Control Board
Molex Connectors
Blower Motor
*High Efficiency (Condensing) Units ONLY:
Green wire & Green Molex