Paloma PH2-20R DVSN, Engineering Handbook

Page: 78 / 172

78 | Page SVC 820 Tankless Gas Trouble Shooting Manual
78
66 – Error Code
Explanation: Water Bypass Valve malfunction. Hot outlet
water temperature is above or below set point on Remote
Control.
Diagnostic Checks:
•
Water Bypass Valve
WATER BYPASS VALVE 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 Water
Bypass Valve.
Turn power OFF. Remove and reinsert connector “B”
on Control Board. Attempt to operate unit again. IF
66 Error Code does NOT display, unit had a loose
connection.
1
2
3
Visually inspect Water Bypass Valve
wiring harness for loose or damaged
terminals. It is located right of the
Blower Motor; below two copper
pipes. Reassemble unit and continue
to diagnostic chart on next page.
Screws
Blow
er
M
ot
or
Top
of
U
nit
Bo
tto
m
o
f U
ni
t
Water Bypass Valve
Control Board
Bottom of Unit