Low
203 on Worcester Bosch Greenstar 8000+ GR8701iW 32 C

Your boiler is working correctly and is simply waiting for a signal from your thermostat or timer to start heating.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

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.

What the manual says

Manufacturer manual

Boiler in standby, no heat energy demand

From this model's manual
Verified against the Worcester Bosch/Worcester Bosch Wb 47114 installation & service 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 that your room thermostat is turned up higher than the current room temperature.Ensure your heating programmer or app is set to an 'On' period.Check if your wireless thermostat has run out of batteries.

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Related fault codes

202View →204View →

All 99 fault codes on the Greenstar 8000+ GR8701iW 32 C

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

200201202204208214224227228229232233234235 V237 V238 V242244245249250251252253254257 V258259262 V263265 B268 O269 V273 B281 B283 O284 O305 O306 V357 O358 O360 V362 V363 V604815 W1010 O10131017 W101810191021 B102310251037 W1065 B1068 W1070107110721075 W1076 W2085 V2908 V2910 V2914291529162920 V2923 V2924292529262927292829312940 V2946 V2948 B2949 B2950 B2951 V2952 V2955 B2956 O2957 V2961 V29622963 B2965 B2966 B2968 O29692970 B2971 B29722980 V2981 V

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