Common Problems And Solutions - Weil-McLain GV90+ User's Information Manual

GV90+ Series 2

Common problems and solutions

Symptom
Rapid cycling — boiler
turns on and off frequently
Frequent release of water
through relief valve
Need to frequently add
makeup water
Black water condition
Large temperature swings
in living space
Part number 550-143-009/0421
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GAS FIRED WATER BOILER
Common Causes
Thermostat installed where
drafts or heat affect reading
Heat anticipator in thermostat
adjusted incorrectly
Incorrect boiler temperature
setting
Insufficient water flow through
boiler
Expansion tank sized too small
Flooded expansion tank
Inoperative limit control
Leaks in boiler or piping
Oxygen corrosion due to leaks
in boiler and piping
Incorrect Economy setting
— User's Information Manual
Possible Corrections
Locate thermostat on inner wall away
from heat sources or cool drafts.
Adjust thermostat per manufacturer's
instructions.
Set boiler temperature according to
system needs. Maximum setting is 200°F.
Increase boiler temperature setting to
decrease cycling.
Check all valves to and from boiler.
Return to proper setting.
Confirm circulator size.
Call qualified service technician to check
expansion tank operation and size.
Call qualified service technician to check
expansion tank operation.
Call qualified service technician to
replace limit control.
Have qualified service technician repair
leaks at once to avoid constant use of
makeup water. Makeup water can cause
mineral deposits which, in turn, can
cause boiler section failure. Do not use
petroleum-base stop-leak compounds.
Have qualified service technician repair
at once. Keep pH of water between 7.0
to 8.5.
Adjust Economy setting on boiler control.
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