Medium
Control 'stat open circuit or waiting for demand on Ideal RD2

Your boiler is currently paused because your home thermostat is either not sending a signal to turn on or is set below the current room temperature.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

What the manual says

Manufacturer manual

On

Shared across the British / Scottish range
This code is shared by the boilers in this range, which use the same control board. It may not be printed in this exact variant’s manual.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

DIY fix possible

Check your main room thermostat to ensure the target temperature is set higher than the current room temperature.Replace the batteries in your wireless wall thermostat if it has a digital display.Turn the boiler off at the mains power switch, wait 30 seconds, and turn it back on to reset the system.

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Related fault codes

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All 10 fault codes on the RD2

Seeing a different code? Every code this model can display, in one place.

Application of powerFan start upLED 3LED 4Lock-outPump over-runReverse polarityRunSensor Faults

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