BoilerFaultCodes.com
4 Low Information

Your boiler is currently focused on heating your hot water tank rather than your radiators, which may cause a temporary pause in your central heating.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: DHW mode: the three way valve or DHW pump activated (Broag priority only)

What causes this fault?

This status occurs when the boiler prioritizes heating the water in your cylinder over the radiators to ensure you have a constant supply of hot water. It is triggered by the cylinder thermostat calling for heat, which tells the boiler to divert its energy away from the heating circuit. Once the water in the tank reaches the set temperature, the boiler should automatically switch back to heating your home.

Typical repair cost £0-120 (including labour)

DIY fix possible

Check if your hot water programmer is turned onWait for the hot water tank to reach its set temperatureEnsure the cylinder thermostat is not set unnecessarily high

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