How much does it cost to fix Ideal error code No DHW But CH Works OK?

Typical repair cost for the Ideal No DHW But CH Works OK fault is £120-£350 including labour.

No DHW But CH Works OK Medium

Ideal No DHW But CH Works OK Fault Code

Q: What does the Ideal No DHW But CH Works OK fault code mean?

Your boiler is working to heat your radiators, but it is failing to detect when you turn on a hot tap or is unable to switch the water flow to your taps.

Also written as NODHWBUTCHWORKSOK — same fault.

The Ideal No DHW But CH Works OK fault code means: your boiler is working to heat your radiators, but it is failing to detect when you turn on a hot tap or is unable to switch the water flow to your taps.. It appears on 3 Ideal models in our database.

Technical description: DHW turbine debris, flow rates, diverter valve motor wiring, or diverter head engagement.

What causes the Ideal No DHW But CH Works OK fault?

This issue occurs when the boiler fails to sense water moving through the pipes when you open a tap, often due to a small internal sensor being blocked by grit or debris. Alternatively, the internal 'shifting' valve may be physically stuck or the motor driving it has failed, meaning the heat stays trapped in the radiators instead of reaching your hot water outlets.

Typical repair cost £120-£350 (including labour)

Engineer required

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

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Ideal models that show the No DHW But CH Works OK fault code

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

Source

Ideal No DHW But CH Works OK fault code information on this page is sourced and cross-checked against the official Ideal service / installation manuals for each affected model.

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