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Heat pumps · Error codes · Kensa
HTPLKensa

HTPL on a Kensa heat pump: Load (distribution) side pressure P1 exceeds the high-pressure limit

Short answer

On a Kensa heat pump, HTPL means: Load (distribution) side pressure P1 exceeds the high-pressure limit. The heat pump stops until the fault clears or is reset. An engineer is needed to fix the cause.

Reviewed 23 September 2026 · 4 sources

What it means

The manual says: Load (distribution) side pressure P1 exceeds the high-pressure limit.

Part involved: P1 load pressure.

When it shows: Error level per manual: Fault.

Likely causes:

  • Distribution-side pressure above the set high limit; release pressure and check water pressures in commissioning mode.
  • General practice: over-filling, filling loop left open, failed expansion vessel.

Is it safe?

Does the heat pump stop?Yes
SeverityFault — clears by itself when the condition goes
Engineer needed?Yes

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

Resetting itself: yes - clears when condition clears (per manual action text).

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. Read the heating-system pressure gauge (or controller pressure screen) and note the value. Read the heating-system pressure gauge and check the filling loop is closed.

What the engineer will check

  • Follow Kensa fault table actions: Distribution-side pressure above the set high limit; release pressure and check water pressures in commissioning mode.

Who to ask for: Heating engineer / GSHP installer.

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