What does the Worcester Bosch 285 fault code mean?

Your boiler has detected that the water returning to it is much hotter than expected, suggesting heat isn't circulating properly through your radiators.

How much does it cost to fix Worcester Bosch error code 285?

Typical repair cost for the Worcester Bosch 285 fault is £120-250 including labour.

Worcester Bosch 285 Fault Code: What It Means & How to Fix It

What the manual says

Manufacturer manual

Return temperature is too hot

From this model's manual

Verified against the Worcester Bosch/Worcester Bosch Worcester Bosch Greenstar 1000 installation & service manual.

What causes this fault?

Overtemperature at return

Engineer required

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

Find a Gas Safe engineer

Search the official register →

Boiler cover options

Avoid the next call-out bill

A cover plan would handle faults like 285: no call-out fees, no surprise bills.

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Related fault codes

284View →

All 106 fault codes on the Greenstar 1000

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

200 201 202 203 204 208 213 214 222 223 224 227 228 229 232 233 234 235 237 238 240 241 245 249 250 251 252 253 254 258 259 262 263 265 268 269 270 273 275 283 284 305 306 341 347 351 353 357 358 360 362 363 364 365 522 604 1010 1013 1018 1019 1021 1023 1025 1068 1073 1074 2085 2908 2910 2915 2916 2920 2923 2924 2925 2926 2927 2928 2930 2931 2940 2946 2948 2949 2950 2951 2952 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2972 2973 2974 2980 2981

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Your boiler has detected that the water returning to it is much hotter than expected, suggesting heat isn't circulating properly through your radiators.

What the manual says

What causes this fault?

Engineer required

Avoid the next call-out bill

Related fault codes

All 106 fault codes on the Greenstar 1000

Related guides you might find useful

No hot water but heating works

Banging / kettling / whistling noise

Radiators cold at the bottom

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