How to Fix Potterton E160 Fault Code (Fan Speed Low) UK
Potterton E160 means fan speed low. UK diagnosis, parts to order, reset sequence.
What E160 means
Potterton E160 indicates fan speed low. The boiler will lock out and refuse to fire until the fault is cleared.
Do not simply reset — E160 is stored in the Potterton error log and will re-trigger within minutes if the underlying part has failed.
Diagnostic sequence
Enter service mode on the Potterton boiler and read the flow/return/DHW temperatures, fan PWM, ionisation current and pump speed.
Cross-reference against the Potterton technical manual — E160 typically points to two or three candidate parts.
- Check wiring harness continuity to the suspect sensor before condemning it.
- Isolate at the fused spur, discharge and re-inspect connectors.
- Measure resistance / voltage at the PCB plug per Potterton test procedure.
Parts to have on the van
Carry a set of NTC sensors, an ignition electrode kit and a fan for Potterton — these three parts clear >70% of E160 call-outs.
Recommission
After the fix, run the Potterton boiler through a full flow test, gas rate, and combustion analysis. Log to the Benchmark book to preserve manufacturer warranty.
Frequently asked questions
- Can I reset E160 without changing parts?
- Only if the fault has cleared (e.g. low pressure repressurised). Persistent E160 means a hardware failure.
- Which is the most common cause of Potterton E160?
- On Potterton boilers, E160 most often points to the sensor or actuator matching its meaning (fan speed low); check wiring and connector integrity first.
- Is a Gas Safe engineer required?
- Yes — any works past the boiler case seal require a Gas Safe registered engineer under UK law.
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