Maintenance and service
C 950/C 1050 (Pro TL 175 C/199 C) – 6 720 805 440 (2019/10)
56
Whenever LCD shows , the temperature setting cannot
be adjusted because the appliance is in use by a user which
already selected a different temperature. Appliance will be
automatically unlock 5 minutes after closing hot water tap.
7 Maintenance and service
DANGER:
▶ Always shut off the electrical power supply, shut off the
manual gas valve and shut off the water valves whenever
servicing.
NOTICE:
▶ Inspect and clean the complete water heating system once
a year.
▶ Carry out maintenance as required. Immediately repair all
faults to avoid damage to the system.
Table 47 Annual maintenance
7.1 Annual maintenance
(To remove front cover, see page 12.)
Venting System
• Venting system - inspect inside of flue pipe for any blockage
or restriction. Observe burner flames during heater
operation. (front cover must be removed). Burner flames
should be steady and blue. Yellow, inconsistent (bouncing)
flames may be an indication of poor ventilation or
combustion air supply. Inspect the combustion air inlet
pipe for blockage or debris. Inspect combustion air and
exhaust terminations for blockage or debris.
Combustion Chamber
• Inspect burner observation window (fig. 80, #14) for
cracks or spillage of flue gases. Observe burner flames
during heater operation. Flames should be steady and blue
with no signs of yellowing. Yellow burner flames are an
indication of improper combustion. Refer to chapter 4.4,
page 38, chapter 4.3, page 15 of this manual to verify
exhaust system and combustion air supply meets
manufacturer's specifications.
Pressure Relief
• Manually open the pressure relief valve to ensure proper
operation.
Inlet Water Filter
• Verify the inlet filter screen is clean and undamaged. The
inlet water filter is located on the bottom of the appliance,
to the right of the cold water inlet fitting. (See fig. 36,
page 44). Close installer supplied water shutoff and
remove wireform spring clip from filter. Remove filter, clean
and or replace if damaged.
Descaling
• In areas where the water supply has a high mineral content,
the heat exchanger should be flushed with a descaling
solution. Scale build up will shorten the life of the water
heater and damage resulting from scale is not covered
under warranty. Refer to chapter 7.3 for detailed
instructions on descaling the heat exchanger.
Fin Coils
• Inspect heat exchanger fin coils for soot build-up or
blockage. To access fincoil, consult service bulletin at
www.boschheatingandcooling.com. If there is evidence of
soot build-up or blockage, the heat exchanger should be
removed by a professional and cleaned thoroughly. Soot is
in indication of incomplete combustion and a clear sign of a
serious problem. Venting, gas pressure and flue gases
should be examined to determine the cause of the problem.
Damage to the water heater caused by incorrect installation
or adjustment are not covered by the manufacturer's
warranty.
Condensate trap
• Check water level in the condensate trap, see fig. 38.
• If appliance is out of service for more than 10 days, fill as
described on page 46.
• Check for debris and clean if needed.
Annual maintenance table
Every year
1. Inspect venting system X
2. Inspect combustion chamber X
3. Inspect burner X
4. Inspect pressure relief X
5. Inspect water filter X
6. Inspect Heat
Exchanger
Descaling X
Fin Coils X
7. Inspect condensate trap X
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