What does the Worcester Bosch 305 fault code mean?

Your boiler is temporarily pausing the hot water production to prevent itself from overheating or cycling on and off too frequently.

How much does it cost to fix Worcester Bosch error code 305?

Cost varies. Contact a Gas Safe registered engineer for a quote.

Worcester Bosch 305 Fault Code: What It Means & How to Fix It

What the manual says

Manufacturer manual

Boiler in hot water anti-cycle mode

From this model's manual

Verified against the Worcester Bosch/Worcester Bosch Wb 45175 installation & service manual.

DIY fix possible

Wait up to 15 minutes for the anti-cycle timer to expireEnsure hot water taps are fully closedCheck that the hot water temperature setting on the control panel is not set excessively high

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Related fault codes

208View →306View →

All 129 fault codes on the Greenstar 2000 GR2300iW 25 C

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

215 V 224 B/V 227 B/V 228 V 229 B 232 B 233 V 234 V 235 V 237 V 238 V 242 V 244 V 245 V 246 247 249 249 V 250 251 252 253 254 256 257 258 259 262 263 264 265 268 269 270 273 275 281 283 284 306 323 328 341 342 350 351 353 354 356 357 358 360 362 363 364 365 604 810 1010 1013 1014 1018 1019 1021 1023 1025 1037 1068 1073 1074 1075 1076 2051 2085 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2920 2921 2922 2923 2924 2925 2926 2927 2928 2930 2931 2932 2940 2941 2942 2943 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2972 2973 2974 3071

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Your boiler is temporarily pausing the hot water production to prevent itself from overheating or cycling on and off too frequently.

What the manual says

DIY fix possible

Avoid the next call-out bill

Related fault codes

All 129 fault codes on the Greenstar 2000 GR2300iW 25 C

Related guides you might find useful

No hot water but heating works

Boiler keeps cutting out

Is boiler cover worth it?

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