Overheat protection lockout
Halstead Ace HE Fault codes & diagnostics
18 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Replaced by: Glen Dimplex / Halstead Eden CB
The fault code is already on your display
Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →
Severity at a glance
Each cell = one fault code. Hover to identify.Which version do you have?
The GC number on your boiler's data badge identifies the exact appliance and production years, as recorded in the UK Product Characteristics Database.
| GC number | Appliance (register name) | Produced |
|---|---|---|
| 47-333-19 | Ace HE 24 | 2005–present |
| 47-333-20 | Ace HE 30 | 2005–present |
Appliance names and production years are taken from the UK Product Characteristics Database (the SAP/SEDBUK register). Where a GC number is also printed in this model's own manufacturer manual, both sources were checked to agree.
All 18 documented codes
Tap any card for details
Differential check faulty/Flame for 15 seconds, Zero check faulty DHW or CH
Failure during an ignition sequence (5 attempts)
Flue gas sensor/No flame, Flue gas temperature greater than 95 °C
Defective sensor or thermal fuse gone, Defective flow, return or flue sensor, or heat exchanger reached maximum safe working temperature
Defective gas valve/Flame continues after 5 sec flame signal after burner demand ends
Defective fan/No flame, Missing or Erroneous RPM signal
PCB error/No flame, Internal error
No flame New BCC (If required)
Activate BCC/No flame, New BCC (If required)
BCC error/No flame, Incorrect /missing BCC
Defective fan/No flame Missing or Erroneous RPM signal
Safety system failure/No flame, Failure of internal self checking system
Water flow failure
Flame for a short period only, Sensor temperature differential incorrect
Power supply error/No flame, Low mains voltage
Failure of internal self checking system
Water flow failure