Weil-McLain GV90+ Installation And Start-Up Manual page 88

GV90+ Series 2
oAs·FIRED WATER BOILER -
Boiler Manual
Troubleshooting
(cootinuedJ
LIMIT and POWER on
IAWARNINBI Eloctrlealshoek hazerd Wherew>r you see TURN OFF POWER,
lollow
the Instructions. Falure to folow
- · lnstructkwls could result In severe rsonal ln u • death or slbstantlal pro ert dama e.
• This Is NOT a lockout mode. The IBC should
only be
signal· • This situation Is usually corrected
by
replacing the sensor,
lng that the water temperature sensor Is either shorted or as
descttNKt betow.
there is an open circuli across the senSOf' c ermlnats.
• Remove SENSOR
plug
from receptacle on IBC (Figure 93,
page
SO, Item 6).
• Then re-insert.
Does UMIT NgtJf stN/IIash?
No
I
Yes
~
• Replaoe return or s.upply sensor and harness.
Does
UMIT light still flash?
No
I
Yes
• Boiler may now be operating correctly. Verify per normal
sequence ol operation (Figure 75, page 66).
• Replaoe IBC (IBC).
• Retest
88 Pan
number
550-142-783/10 12