Alpha Cd13r Fault codes & diagnostics

2 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.

Regular Natural Gas 13 kW Discontinued
GC Numbers 41-532-0241-532-0341-532-0441-532-0541-532-0641-532-08
Download the Alpha Cd13r manual The official installation & service manual (PDF) — the exact document these fault codes were verified against. PDF

The fault code is already on your display

Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →

Fault codes

All 2 documented codes

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C1

Your boiler has stopped working because it is unable to accurately measure the temperature of the water returning to it, so it has shut down as a precaution.

High Engineer only £120-220

Parts commonly replaced

  • Return NTC Thermistor
  • Wiring harness

Related codes

Full explanation for C1
Neon D

Your boiler has lost its power connection, meaning it cannot start up or provide any heating and hot water.

High Engineer only £120-250

Parts commonly replaced

  • Main PCB
  • Internal fuse
  • Wiring harness
Full explanation for Neon D