Bosch Greentherm T9800 SEO199 Installation And Operating Instructions Manual page 45

Display Description
A9 Incorrect output power (too low).
AA Condensing unit flue gases temperature [16]
above 392 °F (200 °C) and/or flue gases
temperature [15] above 145 °F (63 °C) at the
exhaust sensor [15]. Appliance regulates power to
protect against overheating.
BB Fan calibration triggered due to missed ignitions.
BC Successive fan calibration with similar learned
values.
C1 Flue blockage detected during startup due to
insufficient combustion air.
C2
C3 Flow sensor [14] does not detect water
recirculation.
C5 Bypass water valve [8] disconnected or damaged. ▶ Check bypass water valve wire connections.
C7 Fan [2] disconnected or damaged.
C8 Main water valve [22] disconnected or damaged. ▶ Check main water valve wire connections.
C9 Barometric pressure sensor damaged.
Greentherm T9800 SEO 160/199 | SECO 199 – 6 720 817 281 (2018/12)
Solution
▶ Check gas inlet pressure
▶ Check water temperature sensors [17][19][20]
and water flow sensor [14] wire connections.
▶ Check sensors resistance and water flow sensor(
section 11) and replace any if it is not according to
1) 2)
specification.
▶ Descale appliance ( section 7.3).
▶ Check gas inlet pressure ( section 4.13).
▶ Perform gas and air tuning ( section 8.11).
▶ Check gas inlet pressure ( section 4.13).
▶ Perform gas and air tuning ( section 8.11).
▶ Reset error (press and hold on/off button for 3
seconds).
If the problem persists:
▶ Check air openings and exhaust opening for
obstructions and reset the error.
▶ Check if the air filter is dirty or clogged, replace it if
needed.
▶ Perform gas and air tuning ( section 8.11).
▶ Contact Bosch support line for additional
information and assistance in case of installation in
dusty areas.
▶ Check pump and connections.
▶ Check recirculation circuit for any blockage.
If the problem persists:
▶ Replace the bypass water valve and/or wire
1)
connections.
▶ After valve replacement, proceed with bypass water
valve calibration ( section 6.6).
▶ Check fan wire connections.
▶ Reset error (press and hold on/off button for 3
seconds)
If the problem persists:
▶ Replace the fan and/or wire connections.
If the problem persists:
▶ Replace main water valve and/or wire
1)
connections.
▶ Reset error (press and hold on/off button for 3
seconds).
If the problem persists:
▶ Replace electronic control unit (ECU).
Problem solving
1)
( section 4.13).
1)
1)
1)
1)
1)
1)
1)
1)
1)
1)
1)
1)
45