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Heat pumps · Error codes · Warmflow
E084Warmflow

E084 on a Warmflow heat pump: Display and Main Controller Not Compatible

Short answer

On a Warmflow heat pump, E084 means: Display and Main Controller Not Compatible. The heat pump stops until the fault clears or is reset. An engineer is needed to fix the cause.

Reviewed 23 September 2026 · 2 sources

What it means

The manual says: Display and Main Controller Not Compatible.

Part involved: controller/PCB communication.

Likely causes:

  • The software on the Display is not compatible with the main control board.

Is it safe?

Does the heat pump stop?Yes
Engineer needed?Yes

The heat pump stops until the fault clears or is reset.

What you can check

  • Note the exact code shown on the controller (a photo helps) and report it to your installer or the manufacturer's service line.
  • Check the heat pump's supply breaker/isolator at the consumer unit is on (do not open any casing).
  • Check the controller display is lit and showing the code.

What the engineer will check

  • Replace the Display with a compatible version.

Who to ask for: heat pump controls / electrical.

Certification: Electrical competence (Part P / qualified electrician) for work inside control panels.

What you might notice

What owners and engineers report

2 owner and engineer reports mention this.

  • Controller / thermostat problem on the Zeno R290 air source heat pump AS01-R290/AS02-R290/AS03-R290: 1 report
  • Controller / thermostat problem on the Zeno A-Series air source heat pump (R32) AS01-R32/AS02-R32/AS03-R32: 1 report

Sources

A code explains what the controller detected, not a confirmed root cause.

Reviewed: 23 September 2026