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 550-142-803/0712
-
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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