Weil-McLain CGi Series 3 Installation And Maintenance Manual page 56

CG i
GAS-FIRED wATER BOILER- sERIEs a -
Boiler Manual
llc
Troubleshooting - control module lights
(cont.)
CHART 3 - PURGE & POWER hghts flashing
- Usually i ndicates p ressure switch stuck closed or failed to make within 5 minutes -
I& WARNINGI
Electrical shock hazard - Wherever you see & TURN OFF POWER&, follow the instructions. Failure to follow
instructions could result in severe personal injury, death, ()(substantial property damage.
.
Reset boiler control by turning off power at service switch or turning down thermostat for 2 to 20 seconds .
.
Thermostat should call for heat and appropriate zone valves open .
Does inducer motor operate?
No
I I
Yes
+
.
Wait 45 seconds .
Does inducer motor operate?
No
Yes
+
.
Remove INDUCER plug (Figure 38, Item 6, page 53)
Wait 5 minutes .
.
from plug receptacle of control module.
Is PURGE light nashing?
.
Place voltmeter leads across the 120 VAC N and
120 VAC H pins of the INDUCER receptacle (middle and
No
bottom pins).
I I
Yes
Does the voltmeter indicate 120 VAC?
No
Yes
~
.
Try reseating plug in
module receptacle and
.
Boiler should be in
restart.
.
If inducer still does not
normal operating
wort<, replace inducer
sequence.
Are vent or combustion air
assembly.
.
Observe operation until
passages blocked? .
Retest.
thermostat is satisfied
and inducer has
completed its post-purge .
Remove one of the wires connected to the pressure
cycle.
swttch.
.
Check continuity across the swttch terminals .
No
I I
Yes
Does the ohmmeter indicate the switch is closed?
No
I Yes
~ ~
Replace control
.
Check air pressure swttch
.
per manual Section 11 b.
.
Clear passages and
module.
Replace if necessary .
recycle boiler.
Retest.
.
.
.
Retest.
.
Recheck boiler operation .
56
Part Number 550-142-780/0712