Dunkirk Helix VLT Vertical Laser Tube, Wall Hung Modulating Condensing Boiler - Manual (Page 50)

50
13 - TROUBLE SHOOTING
_ _ _ _
_
Lockout Alarm A 0 0 Blocking too long e
rror
Enter Installer Menu, Boil
er
Status. Scr
oll
to
most recent
Lockout Alarm or Blocking Error. Di
agnose corrective action usi
ng
appropriate Trou
blesh
ooting Tree.
Unplug connector on supply
sensor
. Measure continuit
y of high
limit sensor (close/open signal) between two pins connected to two purple wires. Is continuit
y
av
ailable?
NO
YES
Is wire harness connected to both Gas V
alv
e and J13
connector on Control
Module?
NO
YES
Disconnect J13 connector on Control Module. Measure resistance across third (blue wire) and fourth (brown wire)
terminals. Is resistance between 1.0 and 1.2 k
Ω?
NO
YES
Disconnect harness from Gas V
alv
e. Does each
wire ha
ve continuit
y
between Gas V
alv
e and
Control Module
NO
YES
Is supply pipe (copper pipe at top of boiler)
hot?
NO
YES
Boiler has been dry fired. S
ystem has too
much air
. Close manual
gas v
alv
e (shut off gas).
Purge air from system, wait for system to cool.
Replace Supply Sensor
Connect harness
Replace Control
Module
Replace Gas V
alv
e
Replace Harness