Weil-McLain GV90+ User Manual download pdf (Page 13)

Part number 550-142-055/0411

GV90+ gas-fired water boiler — User’s Information Manual

Common problems and solutions

Symptom Common Causes Possible Corrections

Rapid cycling — boiler

turns on and off frequently

Thermostat installed where drafts

or heat affect reading

Locate thermostat on inner wall away from

heat sources or cool drafts.

Heat anticipator in thermostat

adjusted incorrectly

Adjust thermostat per manufacturer’s

instructions.

Incorrect limit setting Set limit according to system needs.

Maximum setting is 200°F. Increase limit

setting to decrease cycling.

Insufﬁcient water ﬂow through

boiler

Check all valves to and from boiler. Return

to proper setting.

Conﬁrm circulator size.

Frequent release of water

through relief valve

Expansion tank sized too small Call qualiﬁed service technician to check

expansion tank operation and size.

Flooded expansion tank Call qualiﬁed service technician to check

expansion tank operation.

Inoperative limit control Call qualiﬁed service technician to replace

limit control.

Need to frequently add

makeup water

Leaks in boiler or piping 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.

Black water condition

Oxygen corrosion due to leaks in

boiler and piping

Have qualiﬁed service technician repair at

once. Keep pH of water between 7.0 to 8.5.

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Weil-McLain GV90+ User Manual Page 13