Honeywell Series 4 Manual Do Utilizador

Part number 550-141-893/0800

11

AHE Series 4 Direct Vent Wall-Mounted Boilers — User’s Information Manual

Common problems and solutions

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 220˚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.

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.

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-based stop-leak compounds.

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.

Mineral deposits in sections due 
to constant use of makeup water

Call qualified service technician to de-lime boiler, if necessary. 
In some cases, deposits will be too heavy to remove with de-
liming procedures.

Have qualified service technician repair leaks to eliminate need 
for constant makeup water.

Incorrect pH of boiler water

Call qualified service technician to check pH level and correct. 
pH should be maintained between 7.0 to 8.5.

Insufficient water flow through 
boiler

Check all valves to and from boiler. Return to proper setting.

Confirm circulator size.

Contaminated combustion air 
supply — See page 4 in this 
manual.

Remove any contaminating products. See page 3 in this 
manual.

Provide outside air for combustion. Kit available through Weil-
McLain distributor. Have qualified service technician pipe-up kit.

Condensation of combustion 
gases in boiler sections

Have qualified service technician inspect system piping and 
controls to verify proper regulation of return water temperature.

Air in system

Bleed air from system through air vents in radiators or 
baseboard units.

Low system pressure

Fill to correct pressure.

Check for leaks in boiler or piping. Have qualified service 
technician repair at once.

High limit set too low

Adjust high limit to higher setting.