Weil-McLain CGi Series 3 Installation And Maintenance Manual page 58

CG i
GAS-FIRED wATER BOILER- sERIEs a -
Boiler Manual
llc
Troubleshooting - control module lights
(cont.)
CHART 5 - PURGE light
flashmg and POWER light on steady
- Usually indicates pressure switch opened during run cycle -
May also be caused by wind gusts in excess of 31 mph for non -direct vent sidewall-vented boilers -
!&WARN ING!
Electrical shock hazard - Wherever you see & TURN OFF POWER& , follow the instructions. Failure to follow
instructions could resuk in severe personal injury, death, or substantial property damage.
.
Reset boiler control by turning off power at service switch or turning down thermostat for at least
45
seconds .
.
Thermostat should call for heat and appropriate zone valves open .
Does blower motor operate?
No Yes
l l
.
Remove INDUCER plug (Figure 38, llem 6, page 53)
from plug receptacle of control module.
.
Place vokmeter leads across the 120 VAC N and
.
Wa~ 5 minutes .
120 VAC H pins of the INDUCER receptacle (middle and
is PURGE light Hashing?
bottom pins).
Does the voltmeter indicate 120 VAC?
No
I
Yes
No
I
Yes
~
.
Replace inducer
assembly.
.
Boiler should be in
.
Retest.
normal operating
sequence.
.
Observe operation until
.
Remove one o f the wires connected to tile pressure
thermostat is satisfied
switch.
and inducer has
.
Check continuity across the switch terminals .
completed its post-
Does the ohmmeter indicate the switch is closed?
purge cycle.
No
I I
Yes
~
.
Inspect and check wire
harness from control
is vent blocked?
module to pressure switch.
No
I I
Yes
I
.
Reseal connector in control
module receptacle.
.
If harness is intact and
properly seated, but
problem persists, replace
.
Check air pressure switch per manual Section 11 b.
.
Clear vent and recycle boiler.
control module.
.
Replace~
necessary. Retest.
.
Recheck boiler operation.
.
Retest.
58 Pari Number 550-142-780/0712