Failure / Error Codes Overview - Bosch Condens 2000 W Service ...

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Failure / Error Codes Overview - Bosch Condens 2000 W Service Manual Hide thumbs 1 Table Of Contents 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

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3.2

Failure / Error Codes Overview

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

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