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Heat pumps · Error codes · Kensa
E1Kensa

E1 on a Kensa heat pump: Loss of contact with a probe inside the heat pump

Short answer

On a Kensa heat pump, E1 means: Loss of contact with a probe inside the heat pump. 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 · 11 sources

What it means

On the Compact (single compressor)

The manual says: Loss of contact with a probe inside the heat pump.

Part involved: Temperature probe.

When it shows: Legacy panel controller: 'Display flashes fault code E1'.

Likely causes:

  • Probe disconnected or faulty.

On the Twin Compressor Compact

The manual says: Loss of contact with a probe inside the heat pump.

Part involved: Temperature probe.

When it shows: Legacy panel controller: 'Display flashes fault code E1'.

Likely causes:

  • Probe disconnected or faulty.

On the Evo

The manual says: T1 temperature probe error (load return).

Part involved: T1 load return probe.

When it shows: Error level per manual: Fault.

Likely causes:

  • T1 probe faulty or disconnected.

On the High Temperature Compact

The manual says: Loss of contact with a probe inside the heat pump.

Part involved: Temperature probe.

When it shows: Legacy panel controller: 'Display flashes fault code E1'.

Likely causes:

  • Probe disconnected or faulty.

On the High Temperature Plantroom

The manual says: Loss of contact with a probe inside the heat pump.

Part involved: Temperature probe.

When it shows: Legacy panel controller: 'Display flashes fault code E1'.

Likely causes:

  • Probe disconnected or faulty.

On the Hybrid Twin Compressor

The manual says: Loss of contact with a probe inside the heat pump.

Part involved: Temperature probe.

When it shows: Legacy panel controller: 'Display flashes fault code E1'.

Likely causes:

  • Probe disconnected or faulty.

On the Plantroom

The manual says: Loss of contact with a probe inside the heat pump.

Part involved: Temperature probe.

When it shows: Legacy panel controller: 'Display flashes fault code E1'.

Likely causes:

  • Probe disconnected or faulty.

On the Q80 Series (Kensa Q)

The manual says: T1 temperature probe error (load return).

Part involved: T1 load return probe.

When it shows: Error level per manual: Fault.

Likely causes:

  • T1 probe faulty or disconnected.

On the Shoebox

The manuals for this range word it in different ways:

  • Loss of contact with a probe inside the heat pump.
  • T1 temperature probe error (load return).

Part involved: Temperature probe; T1 load return probe.

When it shows: Legacy panel controller: 'Display flashes fault code E1'. Error level per manual: Fault.

Likely causes:

  • Probe disconnected or faulty.
  • T1 probe faulty or disconnected.

On the Shoebox NX

The manual says: T1 temperature probe error (load return).

Part involved: T1 load return probe.

When it shows: Error level per manual: Fault.

Likely causes:

  • T1 probe faulty or disconnected.

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.

Manual reset: unknown.

What you can check

  • Note the code shown on the controller/LED; check the heat pump isolator and consumer-unit breaker are on; check thermostat/timer settings.

What the engineer will check

On the Compact (single compressor)

  • Check probe connections/continuity; refer to Kensa Technical department.

Who to ask for: Heat pump controls engineer / Kensa technical support.

Certification: MCS-certified GSHP installer recommended.

On the Twin Compressor Compact

  • Check probe connections/continuity; refer to Kensa Technical department.

Who to ask for: Heat pump controls engineer / Kensa technical support.

Certification: MCS-certified GSHP installer recommended.

On the Evo

  • Follow Kensa fault table actions: T1 probe faulty or disconnected.

Who to ask for: Heat pump controls engineer / Kensa technical support.

Certification: MCS-certified GSHP installer recommended; Kensa-trained.

On the High Temperature Compact

  • Check probe connections/continuity; refer to Kensa Technical department.

Who to ask for: Heat pump controls engineer / Kensa technical support.

Certification: MCS-certified GSHP installer recommended.

On the High Temperature Plantroom

  • Check probe connections/continuity; refer to Kensa Technical department.

Who to ask for: Heat pump controls engineer / Kensa technical support.

Certification: MCS-certified GSHP installer recommended.

On the Hybrid Twin Compressor

  • Check probe connections/continuity; refer to Kensa Technical department.

Who to ask for: Heat pump controls engineer / Kensa technical support.

Certification: MCS-certified GSHP installer recommended.

On the Plantroom

  • Check probe connections/continuity; refer to Kensa Technical department.

Who to ask for: Heat pump controls engineer / Kensa technical support.

Certification: MCS-certified GSHP installer recommended.

On the Q80 Series (Kensa Q)

  • Follow Kensa fault table actions: T1 probe faulty or disconnected.

Who to ask for: Heat pump controls engineer / Kensa technical support.

Certification: MCS-certified GSHP installer recommended; Kensa-trained.

On the Shoebox

  • Check probe connections/continuity; refer to Kensa Technical department.
  • Follow Kensa fault table actions: T1 probe faulty or disconnected.

Who to ask for: Heat pump controls engineer / Kensa technical support.

Certification: MCS-certified GSHP installer recommended; MCS-certified GSHP installer recommended; Kensa-trained.

On the Shoebox NX

  • Follow Kensa fault table actions: T1 probe faulty or disconnected.

Who to ask for: Heat pump controls engineer / Kensa technical support.

Certification: MCS-certified GSHP installer recommended; Kensa-trained.

What you might notice

Sources

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

Reviewed: 23 September 2026