Bosch Combi Boiler Error Codes



Index:

  1. Worcester Bosch Greenstar Error Codes
  2. Bosch Condens 2000 W Error Codes
  3. Bosch Gas Condensing Stainless Steel Boiler SSB Boiler Error Codes
  4. Troubleshooting

1-Worcester Bosch Greenstar Error Codes

In the event that the appliance stops functioning or does not perform as expected, please see table below These problems are some of the most common causes. Should the problem persist or if other fault codes are displayed, then it will be necessary to contact Worcester, Bosch Group.

When calling Worcester, Bosch Group, you may be asked for the error code. This Table is for you to help identify
the possible cause of the fault.




  • Do not try to rectify any of the faults listed below by yourself.
  • Contact British Gas or a competent, qualified engineer (Gas Safe registered personnel)
Reset the Boiler

Reset the Boiler

Error CodesCause/Remedy
b1Code plug not detected.
C6Fan speed too low.
E9Safety temp. limiter in CH flow has tripped
EAFlame not detected. If it safe to do so, check for:gas is on in the house, frozen condensate pipe, blocked flue outlet.
F0Internal error.
F7Flame detected even though boiler switched off.
FAFlame detected after gas shut off.
FdReset button pressed by mistake.
i1Current status. Appliance current operating status.
i2Previous status. Appliance previous operating status.
i3Maximum central heating output. Maximum central heating output (kW) set on the appliance.
i4Maximum domestic hot water output (kW). Maximum domestic hot water output (kW) set on the appliance.
i6Domestic hot water flow detected. A minimum flow rate of approximately 2.9 l/m has been detected by the appliance. YES = Flow detected. No = No flow detected.
i8Ionization current. Measured ionisation current (μA).
i9Flow temperature. Measured primary flow temperature of the appliance ( °C).
i11Domestic hot water outlet temperature. Measured DHW flow temperature of the appliance ( °C).
i12Domestic hot water set temperature. Displays the current set temperature for the domestic hot water.
i15Outdoor sensor. Temperature reading from outdoor temperature sensor, (only available if an outdoor sensor accessory is fitted)
i20CU version. Software version of the control box
i21HMI version. Software version of the HIS (Human Interface Software).
i22HCM version. Identification number of the HCM (Heating Control Module) and release version.
200Central heating system is being heated.
201Domestic hot water system is being heated.
202Anti rapid cycle mode. The boiler has commenced anti-cycle period for CH. Can be adjusted in boiler settings (2.3b). Default 5 Minutes
203System stand by. The appliance is waiting for the heating system to cool.
204System waiting.
208Appliance in service Test mode (Min/Max)
265EMS intelligent controller has forced stan-by-mode due to low heating load. The appliance is compensating for the power required from the EMS room controller is less than the minimum output of the boiler).
268Component test mode. Appliance is running the manual component test as activated in the menus.
270Power up mode. (appliance is powering up).
283Burner starting. The boiler prepares for a burner start. The fan and the pump are being controlled.
284Gas valve(s) opened, flame must be detected within safety time. The boiler prepares for a burner start. The gas valve is being controlled.
305Anti fast cycle mode (domestic hot water keep warm function). Diverter valve is held in hot water position for a period of time (determined by the software) after hot water demand
309Central heating and domestic hot water system are being heated.
357Appliance in air purge mode. Primary heat exchanger air venting program active - approximately 100 seconds.
358Three way valve kick. If the 3-way valve hasn't moved in within 48 hours, the valve will operate once to prevent seizure.

i1,i2,i3,..200,201,202… These are not faults, but provide information concerning the current status of the appliance. During normal appliance operation various Status codes can be displayed by pressing the info button. The first screen of the Information menu displays the current Status code, this will change as the appliance runs through the various modes and sequences.

Operating The Boiler

Operating The Boiler

2-Bosch Condens 2000 W Error Codes

Failure Code on DisplayFailure DescriptonSteps
11MAP not selected (Fan speed adjustment according the flue pipe length).Check the adjustment /selection via service function
A2Combustion chamber NTC failure (behind burner) : when the temperature by CC NTC reached to limitCheck the and the heat exchanger surface, whether is blocked or not. And check the sensor and the connections.
A6 Combustion chamber NTC failure (behind burner) : when NTC not detected or open circuitCheck the and the heat exchanger surface, whether is blocked or not. And check the sensor and the connections
A7Domestic hot water temperature sensor not correct installed or failure.Check the sensor and cable connection.
B3 -> d5Short circuit / failure in water level switch.Check the condensate water drain and recuperator (condens-heatexchanger).
CE -> d4Gradient limit : Temperature rises too rapidly in heating modeCheck the pump, system pressure and by-pass circuit.
C7Fan sensor not detected.Check the fan
C8Fan speed can not reached to target speed.Check the fan for the blockage and the electrical supply
d7Modulator coil failure (regulator valve on gas valve)Check the cable connection.
EAIgnition lock-out (flame not detected) (pump is running)Check the gas cock, gas pressure, electrode and the cable connection
E2Flow temperature sensor failure (pump is running)Check the flow temperature sensor and the connection
E9Overheat 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.
FASafety valve leaks.Check the gas valve, the cable connection and electrode set.

3-Bosch Gas Condensing Stainless Steel Boiler SSB Boiler Error Codes

SSB Boiler Parts

SSB Boiler Parts

Lockout errors

If an error is a “Lockout” error, it is necessary to press “RESET” button (after eliminating the reason for the failure) to restart the boiler. In the following table the “Lockout” errors are listed:

ErrorInt. nr.Description
"Ignit Error"1Three unsuccessful ignition attempts in a row
"Gv Relay Error"2Failure detected in the GV (gas valve) Relay
"Gv Relay Not Open"3Failure detected in the GV (gas valve) Relay
"Gv Relay Not Close"4Failure detected in the GV (gas valve) Relay
"Safety Relay Error" 5Failure detected in the Safety Relay
"Safety Relay Open"6Failure detected in the Safety Relay
"Safety Relay Closed"7Failure detected in the Safety Relay
"Blocking Too Long Error"11Control had a blocking error for more than 20 hours in a row
"Fan Error"12Fan MF deviation for more than 60 sec
"Ram Error"13Internal software error
"Wrong E2prom Signature"14Contents of E2prom is not up-to-date
"X Ram Error"15Internal software error
"E2Prom Error"16No communication with E2prom
"E2Prom Error C"17Wrong safety parameters in E2prom
"E2Prom Error Cal Table"18Wrong calibtration table parameters
"State Error"19Internal software error
"Rom Error"20Internal software error
"Rom Error C" 21Internal software error
"Air Sw Not Open" 22Air pressure switch not working
"15Ms Xrl Error" 23Internal software error
"Air Sw Not Closed"24Air pressure switch not working
“Max. Thermostat Lock Error”25The external overheat protection is
activated
"Stack Error"26Internal error
"Flame Out Too Late Error"27Flame still present 10 sec. after closing
the gas valve
"Flame Error 1"28Flame is detected before ignition
"20Ms Xrl Error"29Internal software error
"41Ms Error"30Internal software error
"Too Many Flame Failures"31Three times flame lost during one
demand
"Flow Switch Not Closed Error"32Flow switch not working / No flow
"Flow Switch Not Open Error"33Flow switch not working / No flow
"Flag Byte Integrity Error"34Internal software error
"Ad Hi Cpl Error"35Internal software error
"Ad Lo Cpl Error"36Internal software error
"Register Error"37Internal software error

Blocking errors

If an error is a “Lockout” error, it is necessary to press “RESET” button (after eliminating the reason for the failure) to restart the boiler. In the following table the “Lockout” errors are listed:

ErrorInt. nr.Description
"Ignit Error"1Three unsuccessful ignition attempts in
a row
"Gv Relay Error"2Failure detected in the GV (gas valve)
Relay
"Gv Relay Not Open"3Failure detected in the GV (gas valve)
Relay
"Gv Relay Not Close"4Failure detected in the GV (gas valve)
Relay
"Safety Relay Error"5Failure detected in the Safety Relay
"Safety Relay Open"6Failure detected in the Safety Relay
"Safety Relay Closed"7Failure detected in the Safety Relay
"Blocking Too Long Error"11Control had a blocking error for more
than 20 hours in a row
"Fan Error"12Fan MF deviation for more than 60 sec
"Ram Error"13Internal software error
"Wrong E2prom Signature"14Contents of E2prom is not up-to-date
"X Ram Error"15Internal software error
"E2Prom Error"16No communication with E2prom
"E2Prom Error C"17Wrong safety parameters in E2prom
"E2Prom Error Cal Table"18Wrong calibtration table parameters
"State Error"19Internal software error
"Rom Error" 20Internal software error
"Rom Error C" 21Internal software error
"Air Sw Not Open"22Air pressure switch not working
"15Ms Xrl Error" 23Internal software error
"Air Sw Not Closed"24Air pressure switch not working
“Max. Thermostat Lock Error”25The external overheat protection is
activated
"Stack Error"26Internal error
"Flame Out Too Late Error"27Flame still present 10 sec. after closing
the gas valve
"Flame Error 1"28Flame is detected before ignition
"20Ms Xrl Error"29Internal software error
"41Ms Error"30Internal software error
"Too Many Flame Failures"31Three times flame lost during one
demand
"Flow Switch Not Closed Error" 32Flow switch not working / No flow
"Flow Switch Not Open Error"33Flow switch not working / No flow
"Flag Byte Integrity Error"34Internal software error
"Ad Hi Cpl Error"35Internal software error
"Ad Lo Cpl Error"36Internal software error
"Register Error"37Internal software error
"WD Error Ram"45Internal software error
"WD Error Rom"46Internal software error
"WD Error Stack"47Internal software error
"WD Error Register"48Internal software error
"WD Error Xrl"49Internal software error
"Refhi Too Lo Error"50Internal software error
"Refhi Too Hi Error" 51Internal software error
"Reflo Too Lo Error"52Internal software error
"Reflo Too Hi Error"53Internal software error
"Flame Error 2"54Flame is detected in a state in which no
flame is allowed to be seen
"Water Level Detect" 55Low water level detected
"Water Level Meas"56Low water level measurement error
"Low Water Cutoff Error"57Low water sensor error
"Low Water Pressure Error"58Low water pressure error
"Low Water Pressure Sensor"59Low water pressure
"Flue Gas Error"60Flue gas pressure error
"Return Temp Error"61Return temperature is higher than stay
burning temperature
"Blocked Drain Error"62Block drain switch is active
"Wd Freq Error"64Incorrect Frequency signal or no
communication with the WD
"Phase Error"65Hot neutral reversed
"Net Freq Error"66Net freq. error detected in the main
"Faulty Earth Error"67Faulty earth connection
"WD Communication Error"68Watchdog communication error
“Overheat Error”70Supply temp exceed the limit
"T Supply Open"72Supply sensor open
"T Return Open"73Return sensor open
"T Dhw Out Open"76DHW sensor open
"T Supply Shorted"80Supply sensor shorted
"T Return Shorted"81Return sensor shorted
"T Dhw Out Shorted"84DHW sensor shorted
"T Flue Shorted"86Flue sensor shorted
"Reset Button Error"87Reset button error
"Appliance Selection"93Appliance selection error
"Gas Pressure Error"107Gas pressure too low or too high
"Flue Press Error"108Flue gas pressure error

4-Troubleshooting




Desired room temperature is not reachedThermostatic radiator valve(s) set too lowIncrease thermostatic radiator valve setting(s).
Temperature control for central heating flow on appliance set too lowIncrease central heating flow temperature control setting.
Low temperature setting on the room thermostatIncrease setting on the room thermostat.
Air trapped in heating systemBleed radiators and re-pressurise the heating system.
Low system water pressureRe-pressurise the system.
Desired room temperature too highThermostatic radiator valves are set to highTurn down thermostatic radiator valves.
Room thermostat is set too highTurn down room thermostat.
Radiators are too hotTemperature control on appliance set too highReduce central heating temperature by turning down the Central Heating control on appliance. Note: This could prevent your property reaching the desired temperature during cold weather periods.
Heating stays on for too longClock is incorrectly setCheck clock setting and adjust.
No blue Operation/Fault Indicator demandMomentary power failureDisconnect appliance supply, wait a few seconds then reconnect.
Heat requirement demand operation light has been deactivatedAsk your installer to reactivate the blue light
Hot water temperature too lowTemperature set too low on appliance controlsCheck setting and adjust.
Water flow at tap too highReduce flow rate at tap.
Air trapped in heating systemBleed radiators and re-pressurise the heating system.
Low system water pressureRe-pressurise the system.
Hot water temperature too highTemperature set too high on appliance controlsCheck setting and adjust.
Water flow at tap too lowIncrease flow rate at tap.

Worcester Bosch Greenstar Manual PDF

Bosch Condens 2000 W Manual PDF

Bosch Gas Condensing Stainless Steel Boiler SSB Boiler Manual PDF

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