How much does it cost to fix Warmhaus error code E04?

Typical repair cost for the Warmhaus E04 fault is £90-210 including labour.

E04 High

Warmhaus E04 Fault Code

Q: What does the Warmhaus E04 fault code mean?

Your boiler has lost the ability to measure the temperature of your tap water, meaning you will likely have no hot water until the sensor is fixed.

The Warmhaus E04 fault code means: your boiler has lost the ability to measure the temperature of your tap water, meaning you will likely have no hot water until the sensor is fixed.. It appears on 1 Warmhaus model in our database.

Technical description: Domestic hot water (DHW) temperature sensor failure – possible error with electronic card or the NTC sensor.

What causes the Warmhaus E04 fault?

This fault occurs when the boiler's internal computer loses communication with the sensor responsible for monitoring your tap water temperature. The most common reason is that the sensor itself has developed an electrical fault or has worn out, though loose wiring or a failure on the main control board can also stop the signal from being received.

Typical repair cost £90-210 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Warmhaus models that show the E04 fault code

Click a model for the full fault code list and model-specific repair notes.

Enerwa / Priwa Repair: £90-210

Source

Warmhaus E04 fault code information on this page is sourced and cross-checked against the official Warmhaus service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026