Igniter; Gas Valve; Blower Housing; Thermal Fuse - Weil-McLain GV90+ Manual

GV90+ Series 2
Troubleshooting

Igniter

Wait several minutes until igniter cools down before at-
tempting replacement. Failure to do so will cause severe
personal injury.
1. Disconnect igniter (Figure 85) from igniter wiring harness and
remove igniter before removing from blower assembly.
2. Replace igniter gasket if original gasket is frayed or damaged OR
if room-temperature resistance across igniter is not between 40
and 95 ohms.
3. Igniter is fragile — handle with care. Do not touch igniter surface
with bare hands. Body oils can cause failure of the carbide.

Gas Valve

The gas valve (Figure 86) operates with a negative
pressure at the outlet — approximately –0.2" w.c. —
DO NOT set gas pressure higher than this.
Follow instructions in this manual carefully if testing
gas valve outlet pressure. Failure to comply can result in
severe personal injury or death.
The gas valve outlet is bolted to the gas line adapter and
sealed with an o-ring. When replacing valve, replace only
with valve listed in this manual for use with the GV90+
boiler. Failure to comply could result in severe personal
injury, death or substantial property damage.

Blower Housing

fire or explosion causing severe personal injury, death or
substantial property damage can result. If you suspect a
problem, replace blower housing. Follow instructions on
page 73 for blower housing removal and replacement.

Thermal fuse

1. The thermal fuse (Figure 88) protects vent pipe from excess flue
temperatures.
2. If the thermal fuse opens, it must be replaced. See page 96 for
replacement information.
If the thermal fuse opens, investigate the cause before
replacing switch and starting the boiler. DO NOT attempt
to jumper the switch. Failure to comply could result in
severe personal injury, death or substantial property
damage.
Part number 550-142-903/1016
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GAS FIRED WATER BOILER
(continued)
— Boiler Manual
Igniter
Gas valve
Blower housing
. A
Thermal fuse
85060
85062
77