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Maintenance And Service - Bosch AQ 125BO LP User Manual

Outdoor water heater piezo ignition
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Maintenance and service

Maintenance and service
Maintenance intervals
The 125 BO requires periodic maintenance. The below
time maintenance intervals should kept the unit
operating for many years.
Every year
B Inspect inlet water filter screen ( 5.2)
B Inspect pilot assembly and flame ( 5.3)
B Inspect burner assembly ( 5.4)
Every 2 years
B Lubricate and clean water valve ( 5.2)
Every 3 to 5 years
B Rebuild water valve ( 5.2)
B Clean pilot assembly and clean or replace orifice
( 5.3)
Water valve
The water valve on this heater should be serviced
B Lubricate component 24 on page 20 with a small
amount of silicon, faucet or lithium grease every two
years to keep its o rings fresh and pushrod sliding
Every 3-5 years replace component 36 on page 20. The
frequency will depend on the mineral content of the
water and conditions of use or whenever signs of
corrosion appear at the gas and water valve joint.
Periodically check that the water inlet filter (#27 on
page 20) is clean as well.
Note: If water valve is removed, be sure to also inspect
the o ring seal on the end of the right hand side water
pipe before re-installing. Lubricating the o ring with
lithium or faucet and valve grease is recommended.
Inspecting pilot
The pilot should burn with a clean sharp blue flame. The
flame should fully envelope the bend of the flame sensor
rod. If it does not, clean the pilot assembly per
procedure below.
Cleaning pilot assembly
Disconnect the flame sensor rod cable and the igniter
cable by pulling gently down. Remove two screws hold-
ing pilot assembly in place. Loosen compression fitting
and remove pilot assembly. Note: The orifice sits on top
of the compression fitting DO NOT LOSE. Polish flame
sensor rod and igniter tip with emery cloth. Clean out
pilot assembly and orifice with carburetor cleaner. If
heater is an LP unit, replace orifice. Caution: Do not
enlarge orifice.
Main burners
The main burner flames should be blue, with a more
intense blue cone in the center core. Yellow flames
could be a sign of wrong size gas orifices or dirty
burners, or a blockage on the heat exchangers fins. If
some burners have yellow flames while others have
good flames, it is likely that dust, lint or spider webs
have partially clogged the burner venturis. To clean the
burners, contact a gas service person.
Vent assembly
Inspect the draft hood and heat exchanger fins for signs
of soot build-up or any other foreign material such as
spider webs. Clean out any debris found in the vent
hood. Signs of soot indicate insufficient combustion air
or exhaust draft. Check for vent assembly blockage or
combustion air blockage on the underside of the unit.
Mineral scale build-up
The 125 BO, when operated at lower temperatures
settings, does not accumulate mineral build-up. If
however, the heater is used at the higher temperature
settings and the water has a high mineral content,
periodic descaling may be necessary. The heating coils
should be flushed with a descaling solution. Consult
your dealer or Controlled Energy for instructions.
Consult your service person.
8 716 473 147


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