ECR International Olsen OLSSC-050, Installation, Operation & Maintenance Manual, Page: 50 / 84

50
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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.
Measure continuit
y of high
limit sensor (close/open signal) between two pins connected to two purple wires. Is continuit
y
av
ailable? Unplug connector on
supply sensor
.
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
(connected to blue wire) and fourth (connected to 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
13 - TROUBLE SHOOTING