Paloma PH2-20R OFN, Engineering Handbook

Page: 54 / 172

54 | Page SVC 820 Tankless Gas Trouble Shooting Manual
54
16 – Error Code
Explanation: Outlet water temperature is too hot. The
water temperature is above the set point on Remote
Control.
Check the Outlet Thermistor FIRST.
Diagnostic Checks:
1. Outlet Thermistor
2. Water Bypass Valve
OUTLET WATER TEMPERATURE SENSOR DIAGNOSTICS:
Turn power OFF. Remove connector “R” on Control
Board. Measure resistance between Black #3 & red
#4 wires: 7K – 23K Ohms. IF OK, attempt to operate
unit again. IF 16 Error Code does NOT display, unit
had a loose connection.
IF resistance tested OK and 16 Error Code IS
displayed, go to Error Code 66 for Water Bypass Valve
diagnostics. IF resistance NOT OK, go to step 2.
Turn power OFF. Remove 3 screws for Control Board
mounting bracket. Remove connectors “M”, “T” &
“G”. Pull control board out of way to access BLACK
Molex for Outlet Thermistor located near the Blower
Motor.
1 2
3
Control Board
Bottom of Unit
Screws
Molex Connectors
Outlet Thermistor
Separate top and bottom of BLACK
Molex for Outlet Thermistor. Top of
Molex has 2 black wires and 1 red
wire. Bottom of Molex has 2 black
wires. Continue to diagnostic chart
on next page.