Problem Solving; Error Code Diagnostics - Bosch Greentherm 9800 SE 160/199 Manual

54 | Problem solving

9 Problem solving
9.1

Error code diagnostics

To remove error codes from the display,
▶ Touch the On/Off button more than 3
sec. (long press).
Display Description
A0 Either cold or hot water temperature sensor fault. ▶ Check temperature sensors and associated
A1 Temperature inside the cabinet is above 158 °F.
AA Flue gas temperatures above 356 °F after the
primary heat exchange and/or 176 °F at the
exhaust sensor.
A2 Tank temperature sensor is not properly installed.
Temperature sensor fault.
A3 Flue gas temperature sensor fault.
A4 Cabinet air temperature sensor fault.
A5 Primary heat exchanger gas temperature sensor
fault.
A6 Inlet water temperature sensor fault.
A7 Heat exchanger temperature sensor fault.
A8 Outlet water temperature sensor fault.
A9 Incorrect output power.
Hot water temperature sensor is not installed
properly.
Incoming gas pressure too low (below 3.5" W.C.
for NG or 8" W.C. for LP)
C5 Fault in the bypass valve.
C7 Fan not working.
C8 Main water valve disconnected.
C9 Barometric pressure sensors fault.
Table 26
6 720 816 815 (2016/10)
Installation, maintenance and repair must only be carried out
by qualified contractors. The following table describes the
solutions for possible problems.
Solution
1) 2)
connections.
▶ Call a qualified contractor.
The appliance automatically regulates the
performance of the appliance to avoid overheating.
▶ External air temperature is above 140 °F.
▶ Check for flue leakages inside the appliance or in
concentric vent.
The appliance is protected against overheating.
▶ Descale appliance.
▶ Check if inlet water temperature is above
maximum limit.
▶ Check temperature sensor and associated
1) 2)
connections.
▶ Check sensor position in the tank pocket.
▶ Check recirculation sub-menu in HMI.
▶ Check connections or replace sensor.
▶ Check connections or replace sensor.
▶ Check connections or replace sensor.
▶ Check connections or replace sensor.
▶ Check connections or replace sensor.
▶ Check connections or replace sensor.
▶ Check incoming gas pressure.
▶ Check hot water temperature sensor.
▶ Check bypass valve connections.
▶ Check fan connections.
▶ Close and open a hot water tap.
▶ Check water valve connections.
▶ Replace Electric Control Unit (ECU).
Greentherm 9800 SE 160/199 | SEC 199
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