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Heat pumps · Error codes · Climer Technology S.L.L
LHPClimer Technology S.L.L · Climer ECOHEAT heat pump water heater (EH)

LHP on a Climer Technology S.L.L Climer ECOHEAT heat pump water heater: Low pressure switch alarm / Device blocked

Short answer

On a Climer Technology S.L.L heat pump, LHP means: Low pressure switch alarm / Device blocked. The heat pump stops until the fault clears or is reset. An engineer is needed to fix the cause.

Reviewed 24 September 2026 · 1 source

What it means

The manual says: Low pressure switch alarm / Device blocked.

Part involved: compressor / refrigerant circuit.

Likely causes:

  • Switch the device off and on.

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: 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.
  • The manual's action is 'switch the device off and on'; if the alarm returns, leave it off and call an engineer.
  • Check the air inlet/outlet ducts or grilles are not blocked.

What the engineer will check

  • Record high/low pressures, discharge/suction temperatures and EEV steps with the unit running.
  • Check water-side flow and air-side coil (blocked/frosted fins).
  • Check pressure switches/transducers and wiring.
  • Leak-test the refrigerant circuit and correct the charge (F-gas / flammable-refrigerant competent engineer only).

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