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.
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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