Press Switch And Power Lights Flashing - Weil-McLain GV90+ Manual

GV90+ Series 2
Troubleshooting
CHART 3
instructions could result 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.
Remove BLOWER plug (Figure 93, page 80, Item 3) from
plug receptacle of IBC.
Place voltmeter leads across the 120 VAC N and 120 VAC H
pins of the BLOWER receptacle.
Does the voltmeter indicate 120 VAC?
No
Does blower wheel turn freely by hand?
No
Properly position blower
wheel on blower motor shaft
and tighten set screw. (Or
replace blower housing
assembly.)
Retest.
Remove one of the red wires connected to the pressure
switch.
Check continuity across the switch terminals.
Does the ohmmeter indicate the switch is closed?
No
Replace IBC.
Retest.
Part number 550-142-903/1016
-
GAS FIRED WATER BOILER
(continued)
PRESS SWITCH & POWER lights flashing
— Wherever you see TURN OFF POWER, follow the instructions. Failure to follow
Does blower motor operate?
No
Yes
at service switch.
Yes
Replace blower motor.
(Also check blower
housing assembly.
Replace if necessary.)
Retest.
Yes
Check air pressure switch per page 76.
Replace if necessary.
Retest.
— Boiler Manual
Thermostat should call for heat and appropriate zone valves
open.
Yes
Is blower wheel turning at speed of blower motor?
No
at
service switch.
Properly position blower
wheel on blower motor
shaft and tighten set screw.
(Or replace blower housing
assembly.)
Retest.
Boiler should be in normal operating se-
quence (Figure 75, page 66).
Observe operation until thermostat is satis-
fied and blower has completed its post-
purge cycle.
Check condensate trap.
Is blower wheel turning at speed of blower motor?
Is there condensate present?
No
No
Are vent or combustion air
passages blocked?
No Yes
Clear passages and recycle boiler.
Recheck boiler operation.
Yes
Wait 5 minutes.
Is purge light flashing?
No Yes
Yes
Yes
Drain condensate.
Retest.
85