H2
Buderus
Water Pressure Sensor Fault
H2 error, furnace will not fire, pressure reading on display is abnormally high or low
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Defective Buderus pressure transducer, Blocked sensor port, Wiring fault between sensor and control, Air pocket at sensor location
How to Fix / Troubleshooting
Safety: Turn off power. Do not overfill the system trying to clear a sensor error.
Steps:
- Compare gauge and display: If your Buderus unit has a mechanical gauge, compare its reading to the digital pressure on the display. A large discrepancy suggests a bad sensor.
- Inspect sensor and tubing: Locate the pressure sensor on the hydraulic block or manifold. Check for kinks, sludge, or blockage in the small port or tube feeding the sensor.
- Bleed air: Air trapped at the sensor can cause false readings. Bleed nearby air vents and gently tap the sensor body.
- Check connector: Reseat the sensor plug on the control board.
If H2 remains, the pressure sensor should be replaced with an OEM Buderus part by a technician.
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Repair Difficulty
Medium
3/5
Required Part
Buderus System Pressure Sensor
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