Weishaupt
Weishaupt Water Heaters Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E01
Water heater does not ignite; burner does not start, display shows E01 shortly after a hot water demand.
Ignition Failure / No Flame Establishment
E02
Burner starts briefly then shuts down; display shows E02 and no sustained hot water.
Flame Loss During Operation
E03
Water heater locks out with E03; fan may start but burner does not ignite, or unit stops shortly after start.
Air Pressure Switch / Fan Proving Fault
E04
Display shows E04 and the burner will not start; unit may attempt ignition several times.
Overheat / Safety Temperature Limiter Trip
E05
Unit shows E05 and shuts down; temperature rises rapidly when burner runs.
Flow Sensor / Temperature Sensor DHW Fault
E06
Display shows E06; water temperature is erratic or unit shuts down intermittently.
Flow Sensor / Turbine Fault
E07
Unit displays E07 and will not operate; may occur immediately on power-up.
Flue Gas Temperature Sensor Fault
E08
Water heater shows E08; fan may not start or runs erratically.
Fan Motor / Speed Feedback Fault
E09
Display shows E09; unit may lock out after several failed ignition attempts.
Gas Valve Control Fault
E10
Unit shows E10; no hot water, and the circulation pump (if present) may not run.
System Water Pressure / Low Water Fault (for sealed systems or combi units)
E11
Display shows E11; unit may shut down during operation with no obvious overheating.
Flow Temperature Sensor Fault (Primary Circuit)
E12
Unit displays E12; burner modulation seems incorrect, water temperature overshoots or undershoots.
Return Temperature Sensor Fault (Primary Circuit)
E13
Display shows E13; unit may shut down during high demand or windy conditions.
Flue Gas / Draft Fault
E14
Unit shows E14; control panel may be unresponsive or display flickers.
Control Board Communication / Internal Error
E15
Display shows E15; unit may not respond to thermostat or DHW demand.
External Control / Communication Fault (e.g., room controller, bus error)
E16
Unit shows E16; burner output is limited and water may not reach set temperature.
Modulation / Gas-Air Ratio Fault
E17
Display shows E17; unit may shut down with no obvious mechanical issue.
Power Supply / Low Voltage Fault
E18
Unit shows E18; condensate may be visible around the base of the heater.
Condensate Drain Fault
E19
Display shows E19; hot water temperature fluctuates or is limited.
DHW Setpoint / Sensor Calibration Error
E20
Unit shows E20; burner stops and will not restart until reset.
Safety Chain Interruption (Limit Switch / Safety Loop Open)
Symptom
Hot water temperature fluctuates between hot and cold during a shower.
Temperature Instability / Flow Modulation Issue
Symptom
On combi models, central heating works but there is no domestic hot water.
Diverter Valve Stuck / DHW Priority Failure
Symptom
On storage-type Weishaupt water heaters, recovery time is very slow and stored water cools quickly.
Storage Tank Heat Transfer / Insulation Fault
Symptom
Water heater emits a burning smell or plastic odor during operation.
Overheating Component / Electrical Overload
Symptom
Water heater emits a whistling or high-pitched noise during operation.
Gas Flow / Burner Resonance Noise
Symptom
Water heater frequently cycles on and off rapidly while hot water is being used.
Short Cycling / Oversized Output
Symptom
Water heater is completely dead; no display, no lights, no response.
No Power / Electrical Supply Failure
Symptom
Water heater is leaking water from the bottom of the casing.
Internal Water Leak
Symptom
Water heater makes loud banging or knocking noises when the burner runs.
Kettling / Boiling in Heat Exchanger
Symptom
Water heater produces a smell of gas near the appliance, especially during or after operation.
Gas Leak / Incomplete Combustion
Symptom
Water heater produces no hot water at all; display is on but burner never starts and no error code is shown.
No Demand Recognition / DHW Flow Detection Failure
Symptom
Water heater provides lukewarm water only; cannot reach the set temperature even at low flow.
Insufficient Burner Output / Partial Blockage
Symptom
Water heater runs but flue terminal shows signs of heavy sooting or dark stains.
Poor Combustion / Sooting
Symptom
Water heater trips the household circuit breaker or RCD when it starts.
Electrical Short / Earth Leakage
Symptom
Water heater vibrates excessively or rattles when the fan or burner is running.
Mechanical Vibration / Mounting Fault
Symptom
Water heater’s condensate trap repeatedly overflows or drips from joints.
Condensate Management / Siphon Failure
Symptom
Water heater’s display is dim, flickering, or unreadable, but the unit still heats water.
Display Backlight / LCD Fault
Symptom
Water heater’s display is on but buttons do not respond or respond intermittently.
User Interface / Keypad Fault
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Water heater does not ignite; burner does not start, display shows E01 shortly after a hot water demand.
|
Ignition Failure / No Flame Establishment | View Details |
| E02 |
Burner starts briefly then shuts down; display shows E02 and no sustained hot water.
|
Flame Loss During Operation | View Details |
| E03 |
Water heater locks out with E03; fan may start but burner does not ignite, or unit stops shortly after start.
|
Air Pressure Switch / Fan Proving Fault | View Details |
| E04 |
Display shows E04 and the burner will not start; unit may attempt ignition several times.
|
Overheat / Safety Temperature Limiter Trip | View Details |
| E05 |
Unit shows E05 and shuts down; temperature rises rapidly when burner runs.
|
Flow Sensor / Temperature Sensor DHW Fault | View Details |
| E06 |
Display shows E06; water temperature is erratic or unit shuts down intermittently.
|
Flow Sensor / Turbine Fault | View Details |
| E07 |
Unit displays E07 and will not operate; may occur immediately on power-up.
|
Flue Gas Temperature Sensor Fault | View Details |
| E08 |
Water heater shows E08; fan may not start or runs erratically.
|
Fan Motor / Speed Feedback Fault | View Details |
| E09 |
Display shows E09; unit may lock out after several failed ignition attempts.
|
Gas Valve Control Fault | View Details |
| E10 |
Unit shows E10; no hot water, and the circulation pump (if present) may not run.
|
System Water Pressure / Low Water Fault (for sealed systems or combi units) | View Details |
| E11 |
Display shows E11; unit may shut down during operation with no obvious overheating.
|
Flow Temperature Sensor Fault (Primary Circuit) | View Details |
| E12 |
Unit displays E12; burner modulation seems incorrect, water temperature overshoots or undershoots.
|
Return Temperature Sensor Fault (Primary Circuit) | View Details |
| E13 |
Display shows E13; unit may shut down during high demand or windy conditions.
|
Flue Gas / Draft Fault | View Details |
| E14 |
Unit shows E14; control panel may be unresponsive or display flickers.
|
Control Board Communication / Internal Error | View Details |
| E15 |
Display shows E15; unit may not respond to thermostat or DHW demand.
|
External Control / Communication Fault (e.g., room controller, bus error) | View Details |
| E16 |
Unit shows E16; burner output is limited and water may not reach set temperature.
|
Modulation / Gas-Air Ratio Fault | View Details |
| E17 |
Display shows E17; unit may shut down with no obvious mechanical issue.
|
Power Supply / Low Voltage Fault | View Details |
| E18 |
Unit shows E18; condensate may be visible around the base of the heater.
|
Condensate Drain Fault | View Details |
| E19 |
Display shows E19; hot water temperature fluctuates or is limited.
|
DHW Setpoint / Sensor Calibration Error | View Details |
| E20 |
Unit shows E20; burner stops and will not restart until reset.
|
Safety Chain Interruption (Limit Switch / Safety Loop Open) | View Details |
| – |
Hot water temperature fluctuates between hot and cold during a shower.
|
Temperature Instability / Flow Modulation Issue | View Details |
| – |
On combi models, central heating works but there is no domestic hot water.
|
Diverter Valve Stuck / DHW Priority Failure | View Details |
| – |
On storage-type Weishaupt water heaters, recovery time is very slow and stored water cools quickly.
|
Storage Tank Heat Transfer / Insulation Fault | View Details |
| – |
Water heater emits a burning smell or plastic odor during operation.
|
Overheating Component / Electrical Overload | View Details |
| – |
Water heater emits a whistling or high-pitched noise during operation.
|
Gas Flow / Burner Resonance Noise | View Details |
| – |
Water heater frequently cycles on and off rapidly while hot water is being used.
|
Short Cycling / Oversized Output | View Details |
| – |
Water heater is completely dead; no display, no lights, no response.
|
No Power / Electrical Supply Failure | View Details |
| – |
Water heater is leaking water from the bottom of the casing.
|
Internal Water Leak | View Details |
| – |
Water heater makes loud banging or knocking noises when the burner runs.
|
Kettling / Boiling in Heat Exchanger | View Details |
| – |
Water heater produces a smell of gas near the appliance, especially during or after operation.
|
Gas Leak / Incomplete Combustion | View Details |
| – |
Water heater produces no hot water at all; display is on but burner never starts and no error code is shown.
|
No Demand Recognition / DHW Flow Detection Failure | View Details |
| – |
Water heater provides lukewarm water only; cannot reach the set temperature even at low flow.
|
Insufficient Burner Output / Partial Blockage | View Details |
| – |
Water heater runs but flue terminal shows signs of heavy sooting or dark stains.
|
Poor Combustion / Sooting | View Details |
| – |
Water heater trips the household circuit breaker or RCD when it starts.
|
Electrical Short / Earth Leakage | View Details |
| – |
Water heater vibrates excessively or rattles when the fan or burner is running.
|
Mechanical Vibration / Mounting Fault | View Details |
| – |
Water heater’s condensate trap repeatedly overflows or drips from joints.
|
Condensate Management / Siphon Failure | View Details |
| – |
Water heater’s display is dim, flickering, or unreadable, but the unit still heats water.
|
Display Backlight / LCD Fault | View Details |
| – |
Water heater’s display is on but buttons do not respond or respond intermittently.
|
User Interface / Keypad Fault | View Details |
No matching codes found
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