Viessmann
Vitocrossal 200 CM2 80
Commercial
80kW
2015-present
ErP A
70 fault codes
<p>The Vitocrossal 200 CM2 80 is a combi boiler from Viessmann, available at 80kW output. Produced 2015-present.</p>
Vitocrossal 200 CM2 80 Fault Codes 70
Code
Description
Severity
Type
02
DHW Sensor Short Circuit
The domestic hot water NTC sensor wiring has a short circuit.
Medium
Engineer
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05
Return Sensor Short Circuit
The return NTC wiring has a short circuit.
Medium
Engineer
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0A
Flow Temperature Sensor Fault
The flow NTC is reading outside expected range.
Medium
Engineer
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0B
Fan Speed Error — Wind Conditions
On Vitodens 200 boilers, code 0B indicates the fan has not idled correctly after an auto-reset,…
Medium
Engineer
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0C
Flame After Shutdown (Vitodens 200)
On Vitodens 200-W boilers, code 0C indicates a flame signal was still present after the burner…
High
Engineer
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0F
Boiler Service Required
Not a fault — this is a maintenance reminder indicating the boiler is due for its…
Low
DIY
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10
DHW Outlet Temperature Sensor Short Circuit
The domestic hot water outlet temperature sensor has a short circuit. The boiler cannot accurately measure…
Medium
Engineer
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18
Pump Blocked or Not Running
The circulation pump is not responding or is mechanically blocked. Water cannot flow through the heating…
High
Engineer
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30
Boiler Water Temperature Sensor Short Circuit
The main boiler water temperature sensor (NTC) has short-circuited. On some Viessmann models the burner continues…
Medium
Engineer
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38
Boiler Water Temperature Sensor Open Circuit
The main boiler water temperature sensor cable has broken or become disconnected.
Medium
Engineer
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40
Internal Bus Communication Fault
There is a communication fault on the internal data bus between boiler components. The PCB may…
High
Engineer
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48
eBUS Communication Fault
The eBUS line between boiler and controller has failed.
Medium
Engineer
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50
No Flame Detected
The boiler has attempted ignition but no flame has been detected by the ionisation electrode.
High
Engineer
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51
Flame Signal Present Without Gas Release
The ionisation electrode is detecting a flame even though the gas valve should be closed. This…
High
Engineer
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5C
Outdoor Temperature Sensor Open Circuit
The outdoor temperature sensor wiring has an open circuit or is disconnected.
Low
Engineer
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71
Outdoor Sensor Short Circuit
The outdoor sensor wiring has a short circuit.
Low
Engineer
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73
Water Pressure Sensor Fault
The electronic pressure sensor is reading incorrectly.
Medium
Engineer
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92
Air/Gas Mixture Setting Error
The combustion air/gas ratio is not within the acceptable range. The boiler is not burning fuel…
High
Engineer
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95
Flame Detected After Shutdown
Flame signal present when gas valve should be closed.
High
Engineer
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A3
Flue Gas Temperature Limiter
The flue gas temperature has exceeded the safety limit. The boiler has shut down to protect…
High
Engineer
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A4
Air Lock in Pump / Insufficient Flow (Vitodens 222-F)
On Vitodens 222-F boilers, code A4 indicates an air lock in the internal circulation pump or…
Medium
DIY
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A6
Low Gas Pressure
The boiler is detecting insufficient gas pressure to operate safely. The gas supply may be interrupted…
High
Engineer
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A9
Condensate Drain Blocked
The condensate drain is blocked or cannot flow freely. The boiler has detected that condensate is…
Medium
DIY
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B1
Coding Plug Missing
The boiler's coding plug is missing or not read correctly. The boiler cannot verify its configuration.
High
Engineer
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C1
Differential Air Pressure Sensor Open Circuit
The differential air pressure sensor has an open circuit, indicating a fault with the sensor or…
High
Engineer
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CE
Water Pressure Too Low (GB162)
On Worcester Bosch GB162 and Viessmann commercial boilers, CE (code 207) indicates the system water pressure…
Low
DIY
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E0
Safety Temperature Limiter Triggered
The boiler has exceeded its maximum safe water temperature. The safety limiter has shut down the…
High
Engineer
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E1
Outdoor Temperature Sensor Fault
The outdoor temperature sensor is not reading correctly. Weather-compensated heating control will not function.
Low
Engineer
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E4
Burner Start Flame Signal Too Weak
The burner attempted to start but the ionisation signal (flame detection) was too weak or missing.…
Medium
DIY
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EA
Ignition Failure / No Flame Detected
On Viessmann Vitodens boilers, code EA (or E4 on some models) indicates the burner flame signal…
Medium
DIY
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F2
Burner Start Fault
The burner has failed to ignite after the start-up sequence. The gas supply, ignition electrode, or…
High
Engineer
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F3
Flame Signal Lost During Operation
The flame was detected but has been lost during normal operation. This may be caused by…
High
Engineer
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F4 EE
Frozen Condensate Pipe
Viessmann's specific code for a frozen or blocked condensate pipe. The most common Vitodens winter fault.
Medium
DIY
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F5
Gas Pressure Switch / No Gas Pressure
The gas pressure switch is showing no gas pressure, or there is an electrical connection fault…
High
Engineer
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F6
Low Water Pressure
The system water pressure has dropped below the minimum safe level. The boiler cannot circulate water…
Low
DIY
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FC
Gas Valve Fault / Flue Blocked
On Viessmann boilers, code FC indicates either a gas valve fault, a faulty modulation valve control,…
High
Engineer
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FE
EMC Interference / PCB Fault
Strong electromagnetic interference (EMC) nearby or a faulty main PCB is causing the burner to block…
High
Engineer
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