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Heat pumps · Error codes · Advantix S.p.A
E801Advantix S.p.A

E801 on an Advantix S.p.A heat pump: Inverter timeout

Short answer

On an Advantix S.p.A heat pump, E801 means: Inverter timeout. The heat pump stops until the fault clears or is reset. An engineer is needed to fix the cause. The wording differs by model range — each is shown below.

Reviewed 24 September 2026 · 4 sources

What it means

On the MAXA i-290 (Gamma i-290)

The manual says: Inverter timeout.

Part involved: compressor inverter drive board.

On the MAXA i-32V5

The manual says: Pressure inverter timeout.

Part involved: compressor inverter drive board.

On the MAXA i-32V5 MIDI (i-32V5H Midi)

The manual says: Inverter communication timeout.

Part involved: compressor inverter drive board.

On the MAXA i-HPV5H

The manual says: Inverter communication timeout.

Part involved: compressor inverter drive board.

Is it safe?

Does the heat pump stop?Yes
Engineer needed?Yes

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

Resetting itself: unknown.

What you can check

  • Note the code shown on the controller and the model number on the unit's rating label before contacting your installer.
  • Check that the heat pump's isolator and consumer-unit breaker are on; do not open any casing.

What the engineer will check

  • Check supply voltage and phase at the unit terminals.
  • Check compressor U/V/W connections and compressor winding resistance.
  • Check drive board heatsink cooling and fan.
  • Replace the inverter/driver board if faults persist.

Who to ask for: Heat pump engineer.

Certification: Heat pump installer competence; F-gas and flammable-refrigerant (R32/R290) handling competence for any refrigerant-circuit work.

What you might notice

Sources

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

Reviewed: 24 September 2026