BoilerFaultCodes Flash Flash On
Go to Fan Lockout section of the fault finding instructions.
Baxi 50 HE Plus Fault codes & diagnostics
12 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Natural Gas 2004-2006 Discontinued
GC Number 41-077-41
Download the Baxi 50 HE Plus manual
PDF
This boiler uses LED flash patterns
Count the flashes in one repeating group before the pause. That number is your fault code. Do not reset until you have noted it. How to read fault codes →
Severity at a glance
Each cell = one fault code. Hover to identify. 12 Unrated
Just want the most common Baxi 50 HE Plus faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes
All 12 documented codes
Tap any card for details
LED / flash-pattern codes
Flash Off Flash
Low Electrical Supply. Incoming Voltage less than 180V. Check System Controls & System Wiring. Otherwise contact Electricity Provider.
Flash Off On
Go to Overheat Lockout section of the fault finding instructions.
Flash On Flash
PCB Fault. Replace PCB.
Flash On On
PCB Fault. Replace PCB.
On Flash Flash
Go to Dry-Fire section of the fault finding instructions.
On Flash On
Go to Thermistor section of the fault finding instructions.
On Off Flash
Live & Neutral Reversed. Incoming Live and Neutral reversed.
On On Flash
PCB Fault. Replace PCB.
Digital codes
Off Off Off
Go to Electrical Supply section of the fault finding instructions.
On Off On
Go to Ignition Lockout section of the fault finding instructions.
On On On
LV Wiring Harness. Ensure 8-way PCB connector securely pushed in. If fault persists replace LV wiring harness.