Dunkirk Helix VLT Vertical Laser Tube, Wall Hung Modulating Condensing Boiler - Manual (Page 58)

58
13 - TROUBLE SHOOTING
YES
Remo
ve all liquid
from connector
.
Check for leaks. Repair all leaks.
Replace Control Module
Replace R
eturn W
ater
Sensor
Is correct harness connected to return
sensor (2 Brown Wires)? YES
NO Correct wiring
Unplug molex connector on return sensor
. Is there moisture or liquid on
metal pins? Liquid might be w
ater or
antifreez
e solution.
NO
Is Heat Ex
changer Pump
properly oriented?
(Pump arrow pointing down?)
YES
NO
Disconnect harness from
Return W
ater Sensor
. Measure
resistance using digital ohm meter
. Is resistance between
950 to 33,000 ohms?
Install Heat
Ex
changer Pump in
proper orientation
YES
NO
Replace
Control
Module
Verify
order of
pins
on
J2.
Pin
order
should
be:
empty,
black (or red),
white,
green.
Measure volts
on
pins
of
black
wire a
nd
white wire.
Is
wiring/pins in
right order?
D
oes black/wire ha
ve 120
VAC? D
oes
white wire/pin have
0
VAC?