Bosch Condens 2000 W, Руководство по обслуживанию

Страница: 7 / 32

Failures / Errors | 7
3.2 Failure / Error Codes Overview
Failure Code
on Display Failure Descripton Steps
MAP not selected (Fan speed adjustment accord-
ing the flue pipe length).
Check the adjustment /selection via service function
2.b.d ).
A2 Combustion chamber NTC failure (behind burner) :
when the temperature by CC NTC reached to limit
Check the and the heat exchanger surface, whether is
blocked or not. And check the sensor and the connec-
tions.
A6
1)
1) Failure codes is adapted to the EMS (>FD660)
Combustion chamber NTC failure (behind burner) :
when NTC not detected or open circuit
Check the and the heat exchanger surface, whether is
blocked or not. And check the sensor and the connec-
tions.
A7 Domestic hot water temperature sensor not correct
installed or failure.
Check the sensor and cable connection.
B3 --> d5
2)
2) Failure codes is adapted to the EMS (>FD660)
Short circuit / failure in water level switch. Check the condensate water drain and recuperator
(condens-heatexchanger).
CE --> d4
3)
3) Failure codes is adapted to the EMS (>FD660)
Gradient limit : Temperature rises too rapidly in
heating mode.
Check the pump, system pressure and by-pass circuit.
C7 Fan sensor not detected. Check the fan.
C8 Fan speed can not reached to target speed. Check the fan for the blockage and the electrical supply.
d7 Modulator coil failure (regulator valve on gas valve) Check the cable connection.
EA Ignition lock-out (flame not detected) (pump is run-
ning).
Check the gas cock, gas pressure, electrode and the
cable connection.
E2 Flow temperature sensor failure (pump is running). Check the flow temperature sensor and the connection.
E9 Overheat lock-out by temperatur limiters (STBs)
(Flue gas + prim. Heatexchanger). In this case ;
Heat demands is blocked and pump stops 3 min.
later.
Check the system presseure, temperature sensor, pump
and fuses on board. Discharge the air in system. Check
also the flue gas pipe and heatexchanger.
FA Safety valve leaks. Check the gas valve, the cable connection and electrode
set.
Tab. 3 Failure codes