Worcester Bosch fault codes, explained.
Find your code below — each guide covers what it means, likely causes, safe checks, and when to call a Gas Safe engineer.
Most searched Worcester Bosch codes
The codes Worcester Bosch owners look up most — each guide explains what the display is telling you, how serious it is, and the safe checks worth trying before you ring us.
Worcester Bosch code library (209)
HOW TO FIX WORCESTER BOSCH A1 FAULT CODE MEANING CAUSES SAFE FIXES How to Fix Worcester Bosch A1 Fault Code – Meaning, Causes & Safe Fixes 1 FLASH 5 SECONDS OFF Worcester Fault Code 1 flash 5 seconds off: Causes & Solutions 1 FLASH 5 SEC OFF Worcester Fault Code 1 flash, 5 sec off: Causes & Solutions 1 LONG FLASH Worcester Fault Code 1 long flash: Causes & Solutions 1 LONG 4 QUICK REPEATED Worcester Fault Code 1 long, 4 quick (repeated): Causes & Solutions 2 FLASHES 5 SECONDS OFF Worcester Fault Code 2 flashes 5 seconds off: Causes & Solutions 2 FLASHES 5 SEC OFF Worcester Fault Code 2 flashes, 5 sec off: Causes & Solutions 2 LONG FLASHES Worcester Fault Code 2 long flashes: Causes & Solutions 2 LONG 4 QUICK REPEATED Worcester Fault Code 2 long, 4 quick (repeated): Causes & Solutions 2 PULSES Worcester Fault Code 2 pulses: Causes & Solutions 3 FLASHES 5 SECONDS OFF Worcester Fault Code 3 flashes 5 seconds off: Causes & Solutions 3 FLASHES 5 SEC OFF Worcester Fault Code 3 flashes, 5 sec off: Causes & Solutions 3 LONG FLASHES Worcester Fault Code 3 long flashes: Causes & Solutions 3 LONG 4 QUICK REPEATED Worcester Fault Code 3 long, 4 quick (repeated): Causes & Solutions 4 FLASHES 5 SECOND GAP 1 LONG FLASH Worcester Fault Code 4 flashes 5 second gap 1 long flash: Causes & Solutions 4 FLASHES 5 SECONDS OFF Worcester Fault Code 4 flashes 5 seconds off: Causes & Solutions 4 FLASHES 5 SEC OFF Worcester Fault Code 4 flashes, 5 sec off: Causes & Solutions 4 FLASHES GAP 1 LONG Worcester Fault Code 4 flashes, gap, 1 long: Causes & Solutions 4 FLASHES GAP 2 LONG Worcester Fault Code 4 flashes, gap, 2 long: Causes & Solutions 4 FLASHES GAP 3 LONG Worcester Fault Code 4 flashes, gap, 3 long: Causes & Solutions 4 FLASHES GAP 4 LONG Worcester Fault Code 4 flashes, gap, 4 long: Causes & Solutions 4 FLASHES GAP 5 LONG Worcester Fault Code 4 flashes, gap, 5 long: Causes & Solutions 4 FLASHES Worcester Fault Code 4 flashes: Causes & Solutions 4 LONG FLASH Worcester Fault Code 4 long flash: Causes & Solutions 4 LONG FLASHES Worcester Fault Code 4 long flashes: Causes & Solutions 4 LONG 4 QUICK REPEATED Worcester Fault Code 4 long, 4 quick (repeated): Causes & Solutions 4 QUICK FLASHES Worcester Fault Code 4 quick flashes: Causes & Solutions 5 FLASHES 5 SECONDS OFF Worcester Fault Code 5 flashes 5 seconds off: Causes & Solutions 5 FLASHES 5 SEC OFF Worcester Fault Code 5 flashes, 5 sec off: Causes & Solutions 5 LONG FLASH Worcester Fault Code 5 long flash: Causes & Solutions 5 LONG FLASHES Worcester Fault Code 5 long flashes: Causes & Solutions 5 LONG 4 QUICK REPEATED Worcester Fault Code 5 long, 4 quick (repeated): Causes & Solutions 5 PULSES Worcester Fault Code 5 pulses: Causes & Solutions 5 SECOND GAP Worcester Fault Code 5 second gap: Causes & Solutions 9A 361 Worcester Fault Code 9A 361: Causes & Solutions 9A 362 Worcester Fault Code 9A 362: Causes & Solutions 9U 233 Worcester Fault Code 9U 233: Causes & Solutions 200 O Worcester Fault Code 200 O: Causes & Solutions 200 Worcester Fault Code 200: Causes & Solutions 201 O Worcester Fault Code 201 O: Causes & Solutions 201 Worcester Fault Code 201: Causes & Solutions 202 O Worcester Fault Code 202 O: Causes & Solutions 202 Worcester Fault Code 202: Causes & Solutions 203 0 Worcester Fault Code 203 0: Causes & Solutions 203 Worcester Fault Code 203: Causes & Solutions 204 O Worcester Fault Code 204 O: Causes & Solutions 204 Worcester Fault Code 204: Causes & Solutions 208 0 Worcester Fault Code 208 0: Causes & Solutions 208 Worcester Fault Code 208: Causes & Solutions 212 Worcester Fault Code 212: Causes & Solutions 224 V Worcester Fault Code 224 V: Causes & Solutions 226 Worcester Fault Code 226: Causes & Solutions 227 V Worcester Fault Code 227 V: Causes & Solutions 228 V Worcester Fault Code 228 V: Causes & Solutions 235 Worcester Fault Code 235: Causes & Solutions 260 Worcester Fault Code 260: Causes & Solutions 265 Worcester Fault Code 265: Causes & Solutions 268 Worcester Fault Code 268: Causes & Solutions 270 Worcester Fault Code 270: Causes & Solutions 283 Worcester Fault Code 283: Causes & Solutions 284 Worcester Fault Code 284: Causes & Solutions 305 0 Worcester Fault Code 305 0: Causes & Solutions 305 Worcester Fault Code 305: Causes & Solutions 306 V Worcester Fault Code 306 V: Causes & Solutions 328 Worcester Fault Code 328: Causes & Solutions 356 Worcester Fault Code 356: Causes & Solutions 360 V Worcester Fault Code 360 V: Causes & Solutions 360 Worcester Fault Code 360: Causes & Solutions 815 W B Worcester Fault Code 815 W/B: Causes & Solutions 1010 O Worcester Fault Code 1010 O: Causes & Solutions 1017 W Worcester Fault Code 1017 W: Causes & Solutions 1021 B Worcester Fault Code 1021 B: Causes & Solutions 1022 B Worcester Fault Code 1022 B: Causes & Solutions 1037 W Worcester Fault Code 1037 W: Causes & Solutions 1065 B Worcester Fault Code 1065 B: Causes & Solutions 1068 W Worcester Fault Code 1068 W: Causes & Solutions 1073 W Worcester Fault Code 1073 W: Causes & Solutions 1074 W Worcester Fault Code 1074 W: Causes & Solutions 1075 W Worcester Fault Code 1075 W: Causes & Solutions 1076 W Worcester Fault Code 1076 W: Causes & Solutions 2920 V Worcester Fault Code 2920 V: Causes & Solutions 2924 V Worcester Fault Code 2924 V: Causes & Solutions 2925 V Worcester Fault Code 2925 V: Causes & Solutions 2927 B Worcester Fault Code 2927 B: Causes & Solutions 2946 V Worcester Fault Code 2946 V: Causes & Solutions 2948 B Worcester Fault Code 2948 B: Causes & Solutions 2950 B Worcester Fault Code 2950 B: Causes & Solutions 2963 B Worcester Fault Code 2963 B: Causes & Solutions 2964 B Worcester Fault Code 2964 B: Causes & Solutions 2965 B Worcester Fault Code 2965 B: Causes & Solutions 2966 B Worcester Fault Code 2966 B: Causes & Solutions 2967 B Worcester Fault Code 2967 B: Causes & Solutions 2970 B Worcester Fault Code 2970 B: Causes & Solutions 2971 B Worcester Fault Code 2971 B: Causes & Solutions A1 281 Worcester Fault Code A1 281: Causes & Solutions A1 Worcester Fault Code A1: Causes & Solutions A3 317 Worcester Fault Code A3 317: Causes & Solutions A7 Worcester Fault Code A7: Causes & Solutions A8 362 Worcester Fault Code A8 362: Causes & Solutions A8 Worcester Fault Code A8: Causes & Solutions B1 Worcester Fault Code B1: Causes & Solutions B7 257 Worcester Fault Code B7 257: Causes & Solutions C1 264 Worcester Fault Code C1 264: Causes & Solutions C4 237 Worcester Fault Code C4 237: Causes & Solutions C4 273 Worcester Fault Code C4 273: Causes & Solutions C6 C6 215 216 Worcester Fault Code C6 / C6 215/216: Causes & Solutions C6 215 Worcester Fault Code C6 215: Causes & Solutions C6 216 Worcester Fault Code C6 216: Causes & Solutions C6 Worcester Fault Code C6: Causes & Solutions C7 C7 214 217 Worcester Fault Code C7 / C7 214/217: Causes & Solutions C7 214 Worcester Fault Code C7 214: Causes & Solutions C7 216 Worcester Fault Code C7 216: Causes & Solutions C7 217 Worcester Fault Code C7 217: Causes & Solutions CC 800 Worcester Fault Code CC 800: Causes & Solutions CE 207 Worcester Fault Code CE 207: Causes & Solutions CE 266 Worcester Fault Code CE 266: Causes & Solutions D1 240 Worcester Fault Code D1 240: Causes & Solutions D1 241 Worcester Fault Code D1 241: Causes & Solutions D3 232 Worcester Fault Code D3 232: Causes & Solutions D4 213 Worcester Fault Code D4 213: Causes & Solutions D4 271 Worcester Fault Code D4 271: Causes & Solutions D4 286 Worcester Fault Code D4 286: Causes & Solutions D4 341 Worcester Fault Code D4 341: Causes & Solutions D5 Worcester Fault Code D5: Causes & Solutions E2 E2 222 223 Worcester Fault Code E2 / E2 222/223: Causes & Solutions E2 222 Worcester Fault Code E2 222: Causes & Solutions E2 223 Worcester Fault Code E2 223: Causes & Solutions E2 233 Worcester Fault Code E2 233: Causes & Solutions E2 350 Worcester Fault Code E2 350: Causes & Solutions E2 351 Worcester Fault Code E2 351: Causes & Solutions E2 Worcester Fault Code E2: Causes & Solutions E5 218 Worcester Fault Code E5 218: Causes & Solutions E9 210 Worcester Fault Code E9 210: Causes & Solutions E9 219 Worcester Fault Code E9 219: Causes & Solutions E9 220 Worcester Fault Code E9 220: Causes & Solutions E9 224 Worcester Fault Code E9 224: Causes & Solutions E9 276 Worcester Fault Code E9 276: Causes & Solutions E9 277 Worcester Fault Code E9 277: Causes & Solutions E9 285 Worcester Fault Code E9 285: Causes & Solutions E9 318 Worcester Fault Code E9 318: Causes & Solutions E9 Worcester Fault Code E9: Causes & Solutions EA EA 227 EA 229 Worcester Fault Code EA / EA 227 / EA 229: Causes & Solutions EA 227 Worcester Fault Code EA 227: Causes & Solutions EA 229 Worcester Fault Code EA 229: Causes & Solutions EA 234 Worcester Fault Code EA 234: Causes & Solutions EA 261 Worcester Fault Code EA 261: Causes & Solutions EA 269 Worcester Fault Code EA 269: Causes & Solutions EA Worcester Fault Code EA: Causes & Solutions EC 256 Worcester Fault Code EC 256: Causes & Solutions EF 349 Worcester Fault Code EF 349: Causes & Solutions EH 258 Worcester Fault Code EH 258: Causes & Solutions F0 237 Worcester Fault Code F0 237: Causes & Solutions F0 238 290 Worcester Fault Code F0 238-290: Causes & Solutions F0 238 Worcester Fault Code F0 238: Causes & Solutions F0 239 290 Worcester Fault Code F0 239-290: Causes & Solutions F0 239 Worcester Fault Code F0 239: Causes & Solutions F0 242 Worcester Fault Code F0 242: Causes & Solutions F0 243 Worcester Fault Code F0 243: Causes & Solutions F0 244 Worcester Fault Code F0 244: Causes & Solutions F0 245 Worcester Fault Code F0 245: Causes & Solutions F0 246 Worcester Fault Code F0 246: Causes & Solutions F0 247 Worcester Fault Code F0 247: Causes & Solutions F0 248 Worcester Fault Code F0 248: Causes & Solutions F0 249 Worcester Fault Code F0 249: Causes & Solutions F0 250 Worcester Fault Code F0 250: Causes & Solutions F0 251 Worcester Fault Code F0 251: Causes & Solutions F0 252 Worcester Fault Code F0 252: Causes & Solutions F0 253 Worcester Fault Code F0 253: Causes & Solutions F0 255 Worcester Fault Code F0 255: Causes & Solutions F0 258 Worcester Fault Code F0 258: Causes & Solutions F0 259 Worcester Fault Code F0 259: Causes & Solutions F0 262 Worcester Fault Code F0 262: Causes & Solutions F0 263 Worcester Fault Code F0 263: Causes & Solutions F0 267 Worcester Fault Code F0 267: Causes & Solutions F0 272 Worcester Fault Code F0 272: Causes & Solutions F0 278 Worcester Fault Code F0 278: Causes & Solutions F0 279 Worcester Fault Code F0 279: Causes & Solutions F0 280 Worcester Fault Code F0 280: Causes & Solutions F0 287 Worcester Fault Code F0 287: Causes & Solutions F0 290 Worcester Fault Code F0 290: Causes & Solutions F0 Worcester Fault Code F0: Causes & Solutions F1 259 Worcester Fault Code F1 259: Causes & Solutions F1 263 Worcester Fault Code F1 263: Causes & Solutions F7 228 Worcester Fault Code F7 228: Causes & Solutions F7 328 Worcester Fault Code F7 328: Causes & Solutions F7 Worcester Fault Code F7: Causes & Solutions FA 306 Worcester Fault Code FA 306: Causes & Solutions FA 364 Worcester Fault Code FA 364: Causes & Solutions FA Worcester Fault Code FA: Causes & Solutions FAST FLASH Worcester Fault Code Fast flash: Causes & Solutions FB 365 Worcester Fault Code FB 365: Causes & Solutions FD 231 Worcester Fault Code FD 231: Causes & Solutions FD Worcester Fault Code FD: Causes & Solutions H07 Worcester Fault Code H07: Causes & Solutions HRE Worcester Fault Code HrE: Causes & Solutions LIGHT OFF Worcester Fault Code Light off: Causes & Solutions LIGHT ON Worcester Fault Code Light on: Causes & Solutions NO CODE 212 Worcester Fault Code NO CODE 212: Causes & Solutions NO LIGHT Worcester Fault Code No light: Causes & Solutions RE Worcester Fault Code rE: Causes & Solutions SLOW FLASH MOSTLY OFF FLASHES ON Worcester Fault Code Slow flash ( mostly off flashes on): Causes & Solutions SLOW FLASH MOSTLY ON FLASHES OFF Worcester Fault Code Slow flash ( mostly on flashes off): Causes & Solutions SLOW FLASH MOSTLY OFF Worcester Fault Code Slow flash (mostly off): Causes & Solutions SLOW FLASH MOSTLY ON Worcester Fault Code Slow flash (mostly on): Causes & Solutions T1 Worcester Fault Code T1: Causes & Solutions T2 Worcester Fault Code T2: Causes & Solutions T3 Worcester Fault Code T3: Causes & Solutions T4 Worcester Fault Code T4: Causes & Solutions T6 Worcester Fault Code T6: Causes & Solutions
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