Part number 550-142-903/1016
88
CHART 6
LIMIT light flashing and POWER light on steady
%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.
s Remove 3%.3/2 plug from receptacle on IBC (Figure 93, page 80, Item 6).
s Then re-insert.
Does ,)-)4 light still flash?
No Yes
s Replace return or supply sensor and harness.
Does ,)-)4 light still flash?
No Yes
s Boiler may now be operating correctly. Verify per normal
sequence of operation (Figure 75, page 66).
s Replace IBC (IBC).
s Retest.
s This is NOT a lockout mode. The IBC should only be signal-
ing that the water temperature sensor is either shorted or
there is an open circuit across the sensor terminals.
s This situation is usually corrected by replacing the sensor,
as described below.
GV90+ Series 2 GAS-FIRED WATER BOILER — Boiler Manual
Troubleshooting (continued)
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