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Heat pumps · Error codes · Samsung
E973Samsung · EHS Mono R290 (AE***CXYD*K and pump-integrated AE***CXYB*K)

E973 on a Samsung EHS Mono R290: Water pressure sensor research (Short/Open)

Short answer

On a Samsung heat pump, E973 means: Water pressure sensor research (Short/Open). The heat pump stops until the fault clears or is reset. An engineer is needed to fix the cause.

Reviewed 23 September 2026 · 1 source

What it means

The manual says: Water pressure sensor research (Short/Open).

Part involved: Water pressure sensor research (Short/Open).

When it shows: Unit self-diagnosis: Water pressure sensor research (Short/Open).

Likely causes:

  • Water-side or tank temperature sensor open/short circuit, detached or mis-configured; connector or PCB fault.
  • Engineer checks per Samsung service manual: Check sensor connection status, sensor location and sensor resistance against the Samsung resistance table (103 or 204 type); replace sensor or PCB if required.

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 full error code shown on the controller; check the heat pump breaker/isolator in the consumer unit is ON; then contact your installer or Samsung service; Samsung manuals do not describe a homeowner reset for this code.

What the engineer will check

  • Check sensor connection status, sensor location and sensor resistance against the Samsung resistance table (103 or 204 type); replace sensor or PCB if required. Any work inside casings, on PCBs, wiring, sensors, pumps, valves or refrigerant is engineer-only.

Who to ask for: Heat pump engineer (Samsung-trained).

Certification: Competent electrical worker (BS 7671).

What you might notice

Sources

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

Reviewed: 23 September 2026