Bosch Greentherm T9800 SEO199 - Page 45

Problem solving
45
Greentherm T9800 SEO 160/199 | SECO 199 – 6 720 817 281 (2018/12)
A9 Incorrect output power (too low). ▶ Check gas inlet pressure
1)
( section 4.13).
▶ 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
specification.
1) 2)
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.
▶ Descale appliance ( section 7.3).
1)
BB Fan calibration triggered due to missed ignitions. ▶ Check gas inlet pressure ( section 4.13).
1)
▶ Perform gas and air tuning ( section 8.11).
1)
BC Successive fan calibration with similar learned
values.
▶ Check gas inlet pressure ( section 4.13).
1)
▶ Perform gas and air tuning ( section 8.11).
1)
C1
C2
Flue blockage detected during startup due to
insufficient combustion air.
▶ 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).
1)
▶ Contact Bosch support line for additional
information and assistance in case of installation in
dusty areas.
C3 Flow sensor [14] does not detect water
recirculation.
▶ Check pump and connections.
1)
▶ Check recirculation circuit for any blockage.
C5 Bypass water valve [8] disconnected or damaged. ▶ Check bypass water valve wire connections.
1)
If the problem persists:
▶ Replace the bypass water valve and/or wire
connections.
1)
▶ After valve replacement, proceed with bypass water
valve calibration ( section 6.6).
1)
C7 Fan [2] disconnected or damaged. ▶ 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.
1)
C8 Main water valve [22] disconnected or damaged. ▶ Check main water valve wire connections.
1)
If the problem persists:
▶ Replace main water valve and/or wire
connections.
1)
C9 Barometric pressure sensor damaged. ▶ Reset error (press and hold on/off button for 3
seconds).
If the problem persists:
▶ Replace electronic control unit (ECU).
1)
Display Description Solution