Fan cable needs checking, fan or burner controller could need replacing
The F008 error code on Intergas boilers indicates fan cable needs checking, fan or burner controller could need replacing.
Intergas F008 means: fan cable needs checking, fan or burner controller could need replacing. The usual causes are fan motor failure (seized bearings or burned windings), fan speed sensor fault or wiring fault between fan and pcb. A Gas Safe registered engineer should diagnose the root cause.
What Does F008 Mean
The F008 code is shown by the boiler’s control board when it detects fan cable needs checking, fan or burner controller could need replacing. The boiler then stops instead of continuing to run in that condition: the code is the appliance reporting a problem, not proof that the boiler is broken.
| What you see on the boiler |
|---|
| The display shows F008 and the boiler stops until the fault is cleared |
Common Causes
Causes documented in 2 technical sources.
| Cause |
|---|
| Fan motor failure (seized bearings or burned windings) |
| fan speed sensor fault |
| wiring fault between fan and PCB |
| air pressure switch fault (stuck open or closed) |
| blocked flue or air intake restricting airflow |
| condensate blocking the siphon or trap |
Safety Warning
F008 is a gas-related fault. Never attempt to repair or adjust the gas valve, burner assembly, or flue system yourself. All gas work must be carried out by a Gas Safe registered engineer (UK) or licensed HVAC technician (US). Repeated resets after ignition failure can cause unburnt gas to accumulate inside the combustion chamber — this is a serious safety hazard. If you smell gas at any point, turn off the gas supply at the meter, open windows, leave the property, and call your gas emergency service immediately. Gas-related fault. Do not open the boiler casing or attempt repairs to the gas valve, burner, ignition or flue. Repeated resets are unsafe. Diagnosis and repair must be carried out by a Gas Safe registered engineer.
Parts & Prices
Prices shown are indicative. Actual prices and availability vary by region.
Step-by-Step Diagnosis
Listen for the fan — it should start before ignition. If silent, check power supply to the fan motor
Spin the fan manually (with power off) — if it feels stiff or gritty, the bearings are worn
Check the wiring connections between the fan and PCB
Test the air pressure switch — with the fan running, the switch should close. Disconnect and test with a multimeter for continuity
Check the flue for blockages — inspect the full length including the terminal
Verify the condensate trap is clear
Measure the fan speed signal at the PCB (Hall sensor output)
How to Fix It
Replace the fan motor assembly if bearings are worn or motor is not running
replace the air pressure switch if it is stuck or reading incorrectly
clear any flue or condensate blockage
repair or replace damaged wiring
if PCB is not providing the signal, replace the PCB
Refer to the Intergas service documentation for the detailed procedure. Only a qualified engineer should carry out these repairs.
Diagnostic Tools
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Affected Models
Intergas models that can display fault code F008:
| Model Family | Output Range | Frequency |
|---|---|---|
| All Intergas models | — | Possible |
Frequently Asked Questions
Replace the fan motor assembly if bearings are worn or motor is not running. According to the technical documentation, this is the first check on the list for F008.
F008 is classified as a high-severity fault: it involves gas, combustion or flue components. Do not keep resetting the boiler and do not attempt the repair yourself — call a Gas Safe registered engineer.