Verified boiler fault code
Potterton E317 Fault Code (Assure Combi & System)
Wrong electrical supply frequency.
Safety disclaimer
Fault code summary
- Manufacturer
- Potterton
- Fault code
- E317
- Fault type
- Electrical
- Severity
- Not specified
- Reset
- Not specified
- Applicable models
- Potterton Assure Combi, Potterton Assure System
Quick answer
Wrong electrical supply frequency.
What does this fault code mean?
Wrong electrical supply frequency.
Common causes
- Electrical supply frequency is incorrect.
Symptoms
- The boiler displays E317 and may stop operating.
What can the homeowner safely check?
- Note the code and check whether other appliances have an electrical supply problem.
Boiler reset information
Reset information was not provided in the verified manufacturer source. Do not repeatedly reset an unresolved fault.
When should I call an engineer?
Contact a suitably qualified heating engineer when the fault persists, the boiler locks out, or the manufacturer instructions do not resolve it. For gas appliance work in the UK, use a Gas Safe registered engineer.
Engineer diagnosis
- Verify the electrical supply frequency and PCB sensing.
Applicable boiler models
Related fault codes
- E09 — Assure Combi & System
Gas valve connection fault.
Read fault code - E10 — Assure Combi & System
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Precirculation alarm.
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The boiler maximum temperature was exceeded, or the safety thermostat sensor tripped.
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Water pressure is low, below 0.5 bar.
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Differential water-flow switch fault; the switch is still open.
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Water circulation fault.
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Safety error for frequent loss of flame.
Read fault code
Manufacturer documentation
Boiler Error Codes | BaxiPotterton Assure Combi & System — E317 / 162: Wrong power supply electrical frequency (Hz).
Last verified
2026-09-12
Frequently asked questions
What does Potterton E317 mean?
Wrong electrical supply frequency.