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Heat pumps · Error codes · Warmflow
E071Warmflow

E071 on a Warmflow heat pump: Outlet Water Temp. Lowtemp

Short answer

On a Warmflow heat pump, E071 means: Outlet Water Temp. Lowtemp. The heat pump stops until the fault clears or is reset. An engineer is needed to fix the cause.

Reviewed 23 September 2026 · 2 sources

What it means

The manual says: Outlet Water Temp. Lowtemp.

Part involved: water flow / water temperature.

Likely causes:

  • The temperature of the outlet water is too low.

Is it safe?

Does the heat pump stop?Yes
Engineer needed?Yes

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

What you can check

  • Note the exact code shown on the controller (a photo helps) and report it to your installer or the manufacturer's service line.
  • Check the heat pump's supply breaker/isolator at the consumer unit is on (do not open any casing).
  • Check the heating system pressure gauge reading (if one is fitted) and tell your engineer if it is below the level set at commissioning; do not attempt to refill unless you have been shown how.

What the engineer will check

  • Check there is enough water in the system and there are no air locks/lack of flow.

Who to ask for: heating / hydraulics.

Certification: Competent heating engineer (manufacturer training recommended).

What you might notice

What owners and engineers report

2 owner and engineer reports mention this.

  • Keeps stopping / cutting out on the Zeno A-Series air source heat pump (R32) AS01-R32/AS02-R32/AS03-R32: 1 report
  • No heating on the Zeno A-Series air source heat pump (R32) AS01-R32/AS02-R32/AS03-R32: 1 report

Sources

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

Reviewed: 23 September 2026