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Maintenance And Service; Annual Maintenance; Winterizing For Seasonal Use - Bosch Greentherm T9800 SEC 199 Installation And Operating Instructions Manual

Indoor residential and commercial tankless water heaters
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50 | Maintenance and service

Maintenance and service
▶ Always shut off the electrical power
supply, shut off the manual gas valve
and shut off the water valves whenever
▶ Replace all dismantled joints and o-rings
with new ones.
▶ Inspect the complete water heating
system once a year.
▶ Follow points 5 and 6 in Table 21 after
400 operation hours or 25000 cycles
(whichever occurs first), see
chapter 6.5.1 (Data History).
▶ Inspect the water heater and
components for wear or fatigue.
Immediately repair all faults to avoid
damage to the system.
Annual maintenance table
1. Inspect venting system
2. Inspect combustion chamber
3. Inspect burner
4. Inspect pressure relief
5. Inspect water filter
6. Heat Exchanger Descaling
7. Inspect condensate trap
Table 21 Annual maintenance
1) Proceed with burner cleaning if error code CE is displayed.
Check the flue exhaust for blockage (appliance is protected
against flue blockage).
2) Proceed with heat exchanger descaling whenever error
codes AA and E5 are displayed (appliance is protected
against over heating in case of scaling).
6 720 816 815 (2018/08)
(To remove front cover, see page 10)
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 intake
pipe for blockage or debris. Inspect air intake and exhaust
terminations for blockage or debris.
Heat Exchanger
Inspect burner observation window 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 section 4.6 to verify the
exhaust system and combustion air supply meets the
manufacturer's specifications.
Pressure Relief
Manually open the pressure relief valve to ensure proper
Every year
Inlet Water Filter
Verify the inlet water filter screen is clean and undamaged.
The inlet water filter is located on the top of the appliance,
at the cold water inlet connection. (See Fig. 29, page 34).
Close the installer supplied water shutoff valve and remove
the brass hex cap holding filter. Remove the filter, clean
and or replace if damaged.
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 section 7.3 for detailed
instructions on descaling the heat exchanger.
Condensate Siphon
Check for debris and clean if needed.
The water heater must not be installed in a location where it
may be exposed to freezing temperatures. If the heater must be
WARNING: Gas leakage!
▶ Replace burner seals in case burner is
disassembled. Consult spare part list at

Annual maintenance

Winterizing for seasonal use

Greentherm T9800 SE 160/199 | SEC 199

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