Ideal Classic NF30–NF80 Fault codes & diagnostics

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

Regular Natural GasLPG 8.8-23.4 kW 1994-2003 Discontinued

Replaced by: Classic SE

Download the Ideal Classic NF30–NF80 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 →

Severity at a glance

Each cell = one fault code. Hover to identify.
5 High 2 Low
Just want the most common Ideal Classic NF30–NF80 faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes

All 7 documented codes

Tap any card for details

13

Your boiler is not receiving any electrical power, so the main power light remains off and the unit cannot start.

High DIY-safe £60-180

What to check first

  1. Check if your home's main electrical consumer unit has a tripped circuit breaker.
  2. Ensure the boiler's fused spur switch (usually near the boiler) is turned on.
  3. Check if your external room thermostat or programmer is set to 'On' and has power.
  4. Check the fuse in the boiler's power switch (only if comfortable changing a standard plug-style fuse).

Parts commonly replaced

  • External fuse
  • Internal PCB fuse
  • Control Programmer
  • Wiring harness
Full explanation for 13
H E

Your boiler has detected an internal computer error, meaning its 'brain' is failing to communicate properly and it cannot safely run.

High Engineer only £250-450

Parts commonly replaced

  • Printed Circuit Board (PCB)

Related codes

Full explanation for H E
L A

Your boiler has detected that it is running too hot and has automatically switched itself off to prevent damage.

High Engineer only £120-250

Parts commonly replaced

  • Overheat thermostat
  • Pump
  • PCB

Related codes

Full explanation for L A
L E

Your boiler's electronic command center has detected an internal error and has stopped working to prevent further damage.

High Engineer only £250-400

Parts commonly replaced

  • Printed Circuit Board (PCB)

Related codes

Full explanation for L E
Neon I1

Your boiler is failing to start because it detects that the internal fan system is not operating correctly, likely due to a sensor incorrectly reporting air pressure levels before the system has even begun to run.

High Engineer only £150-250

Parts commonly replaced

  • Air pressure switch
  • Fan assembly
  • Venturi

Related codes

Full explanation for Neon I1
Neon I3

Your boiler is receiving power and is currently in its normal standby state, meaning it is ready to fire up whenever you turn on your heating or hot water.

Low DIY-safe

What to check first

  1. No action is required as this is a normal operating status light
  2. Check your thermostat settings if you were expecting the heating to be on
Full explanation for Neon I3
Status & diagnostic codes

5 operating states & engineer diagnostics

Not faults — these are normal operating states. Tap to expand.

H 1 Diagnostic Your boiler is overheating because it cannot circulate heat effectively, so it has safely shut itself down to prevent damage. Neon l1 Status Your boiler has detected that the internal fan or air pressure system is sticking in the 'on' position, preventing it from starting its safety checks. Neon l2 Status Your boiler is correctly receiving a signal from the thermostat that the house needs heat, but it has not yet started the ignition process to fire up. Neon l3 Status Your boiler is receiving electrical power and is currently sitting in standby mode waiting for a command to heat up. Neon SG1 Status Your boiler is currently trying to light the gas burner with a spark, which is a normal part of the starting process.