PART 16 Maintenance Checklist
WARNING
Allowing the heater to operate with a dirty combustion chamber will hurt operation. Failure to clean the heat exchanger as
needed by the installation location could result in heater failure, property damage, personal injury, or death. Such product failures
ARE NOT covered under warranty
Periodic maintenance should be performed once a year by a qualified service technician to assure that all the equipment
is operating safely and efficiently. The owner should make necessary arrangements with a qualified heating contractor
for periodic maintenance of the heater. Installer must also inform the owner that the lack of proper care and maintenance
of the heater may result in a hazardous condition.
Maintenance Table
Table 16.1 Maintenance Checklist
74
Check system and boiler piping for any sign of leakage.
Take off boiler cover and inspect connections in boiler
for any leaks or corrosion
Check condition of all vent pipe and joints
Check gas piping, test for leaks and signs of aging.
Confirm gas pressure and note pressure drop upon
start-up. Confirm CO2 at high and low fire (ideal 9%)
Do visual inspection of all system components and
verify programmed temperature settings
Check wire connections and make sure they are tight
Check burner tube and combustion chamber coils.
Clean with nylon brush and vacuum. Avoid touching
white ceramic fiber. Also see maintenance section of
manual
Ensure spacing of igniter prongs are aligned properly.
Also see page 64.
Disconnect condensate hose and cup. Ensure no
blockage, rinse and clean out. Fill half way again with
fresh water and re-install
Check to make sure it is not weeping
Listen to sound of the pump and fan. If either makes
noise during operation, it is recommended to replace
the part preventatively.
Domestic HW
in COMBI
models
In cases where homeowner complains of too little water
supply, check the water filter on cold water inlet for dirt.
If it is clean, descale the DHW plate heat exchanger. If
still have complaints, replace the DHW heat exchanger.
Question homeowner before maintenance if they have
any issues and after done, confirm activities you
performed during maintenance visit
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