SolarpunkHomes
Sign inCall us · +44 7510 081687
Heat pumps
Heat pumps · Error codes · Vaillant
F.582Vaillant

F.582 on a Vaillant heat pump: Fault: EEV

Short answer

On a Vaillant heat pump, F.582 means: Fault: EEV. 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 23 September 2026 · 2 sources

What it means

On the aroTHERM plus (VWL ../6 A)

The manual says: Fault: EEV.

Part involved: EEV.

Likely causes:

  • EEV is not connected correctly or there is a cable break to the coil.

On the aroTHERM

The manual says: EEV fault.

Part involved: EEV fault.

Likely causes:

  • Cable insulation defective; connection broken.

Is it safe?

Does the heat pump stop?Yes
SeverityFault — needs a manual reset once the cause is fixed
Engineer needed?Yes

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

Resetting itself: no - the fault remains displayed until the cause is eliminated.

Manual reset: yes - after the cause is eliminated, press the reset button (indoor unit) or reset via the system control; if it recurs after several resets contact customer service.

What you can check

On the aroTHERM plus (VWL ../6 A)

  • Note the full code and text shown on the display (and the date/time it appeared). Check the outdoor unit's air inlet and outlet are not blocked by leaves, debris, snow or ice build-up and clear any loose debris from around it (do not open the casing, poke the fins or use tools). The operating instructions allow the reset button on the indoor unit (or a reset via the system control) to be pressed once; if the code returns, do not keep resetting - contact your installer or Vaillant. If you smell gas/solvent near the outdoor unit or hear hissing, switch the heat pump off at the isolator, keep ignition sources away and call an engineer.

On the aroTHERM

  • Note the full code and text shown on the display (and the date/time it appeared). Check the outdoor unit's air inlet and outlet are not blocked by leaves, debris, snow or ice build-up and clear any loose debris from around it (do not open the casing, poke the fins or use tools). Do not keep resetting the unit; report the code to your installer (the operating instructions for this product were not checked for a homeowner reset procedure). If you smell gas/solvent near the outdoor unit or hear hissing, switch the heat pump off at the isolator, keep ignition sources away and call an engineer.

What the engineer will check

On the aroTHERM plus (VWL ../6 A)

  • Check the plug connections and, if required, replace the coil from the EEV.

Who to ask for: F-gas certified refrigeration engineer with heat pump experience (R290 flammable-refrigerant competence required for aroTHERM plus / GeniaAir).

Certification: F-gas Category I (Regulation (EU) 517/2014 as retained in GB) certificate; flammable (R290) refrigerant training for R290 units.

On the aroTHERM

  • Diagnose per cause list in the aroTHERM installer fault table; inform Vaillant technical support (0330 100 3540) for refrigerant-circuit faults.

Who to ask for: F-gas certified refrigeration engineer with heat pump experience (R290 flammable-refrigerant competence required for aroTHERM plus / GeniaAir).

Certification: F-gas Category I (Regulation (EU) 517/2014 as retained in GB) certificate; flammable (R290) refrigerant training for R290 units.

What you might notice

What owners and engineers report

16 owner and engineer reports mention this.

  • No heating on the aroTHERM plus (VWL ../6 A): 8 reports
  • Keeps stopping / cutting out on the aroTHERM plus (VWL ../6 A): 6 reports
  • No heating on the aroTHERM: 2 reports

Sources

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

Reviewed: 23 September 2026