Part number 550-142-903/1016
83
Boiler should now operate
normally.
Problem is with incoming
electricity. Have licensed
electrician repair circuit.
Have system checked by a
licensed electrician.
If problem persists, call your
local Weil-McLain sales repre-
sentative.
CHART 1
Troubleshooting POWER light status
%LECTRICALSHOCKHAZARD — Wherever you see TURN OFF POWER, follow the instructions. Failure to follow
instructions could result in severe personal injury, death or substantial property damage.
434!4#)2#
light flashing
CHART 2,
page 84
02%3337)4#(
light flashing
CHART 3,
page 85
&,!-%
light flashing
CHART 4,
page 86
NO LIGHT IS
FLASHING,
but there is
insufficient heat
CHART 7,
page 89
3ENSOR'ROUND
light solid.
CHART 8,
page 90
Is 0/7%2 light off?
No Yes
s Make sure service switch or circuit breaker is on or fuses
are good.
s Remove 6!#). plug (Figure 93, page 80, Item 1) on
IBC.
s Using voltmeter, check across top and bottom pins
of 6!#). receptacle.
Does voltmeter indicate 6!#?
No Yes
s Reconnect 6!#). plug.
s Remove 6!# transformer 02)-!29 plug
(Figure 93, page 80, Item 2) on IBC.
s Using voltmeter, check across top and bottom pins of 02)
-!29 receptacle.
Does voltmeter indicate 6!#?
No Yes
s Reinstall 6!# transformer 02)-!29 plug.
s Remove 6!# transformer plug (Figure 93, page 80,
Item 7) on IBC.
s Using voltmeter, check across pins of receptacle.
Does voltmeter indicate 6!#?
No Yes
Replace transformer.
Retest.
Replace IBC.
Retest.
Replace IBC.
Retest
Is 0/7%2 light . . .
Flashing
alone?
Flashing with
another light?
On steady
(NOT flashing)?
s Usually indicates polarity on incoming 6!# power
line is wrong.
s 452./&&0/7%2 at service switch or breaker, then
reverse the HOT and NEUTRAL wires entering the boiler
in the J-box.
s Restore 0/7%2 at service switch or breaker.
Is 0/7%2 light flashing now?
No Yes
GV90+ Series 2 GAS-FIRED WATER BOILER — Boiler Manual
Troubleshooting (continued)
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