Verified boiler fault code

Potterton E84 Fault Code (Assure Combi & System)

No communication.

Safety disclaimer

Boiler repair help from Aza & Sons Services

Fault code summary

Manufacturer
Potterton
Fault code
E84
Fault type
Communication, PCB/electronics
Severity
Not specified
Reset
Not specified
Applicable models
Potterton Assure Combi, Potterton Assure System

Quick answer

No communication.

What does this fault code mean?

No communication.

Common causes

  • Communication failure.

Symptoms

  • The boiler displays E84 and may stop operating.

What can the homeowner safely check?

  • Note the code and consult the Potterton instructions.

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

  • Check communication wiring and the connected control electronics.

Applicable boiler models

Related fault codes

Manufacturer documentation

Boiler Error Codes | Baxi

Potterton Assure Combi & System — E83 / E84 / E85 / E86 / E87: No communication.

Last verified

2026-09-12

Frequently asked questions

What does Potterton E84 mean?

No communication.