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Heat pumps · Error codes · Warmflow
Brine-flow-rate-too-lowWarmflow · Zeno G-Series ground source heat pump GS08/GS16/GS03

Brine-flow-rate-too-low on a Warmflow Zeno G-Series ground source heat pump GS08/GS16/GS03: Brine flow rate too low or blocked

Short answer

On a Warmflow heat pump, Brine-flow-rate-too-low means: Brine flow rate too low or blocked. The manual does not say whether the heat pump stops. An engineer is needed to fix the cause.

Reviewed 23 September 2026 · 1 source

What it means

The manual says: Brine flow rate too low or blocked.

Part involved: water flow / water temperature.

Likely causes:

  • The brine flow rate has dropped below the minimum threshold.

Is it safe?

Does the heat pump stop?Not stated
Engineer needed?Yes

The manual does not say whether the heat pump stops.

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

  • Fully purge the system of air (common in new installations).
  • Check for blockages in filters, valves etc.
  • Check the system pressure hasn't dropped.
  • Ensure brine pump is functioning correctly.

Who to ask for: heating / hydraulics.

Certification: Competent heating engineer (manufacturer training recommended).

What you might notice

What owners and engineers report

1 owner and engineer report mentions this.

  • No heating on the Zeno G-Series ground source heat pump GS08/GS16/GS03: 1 report

Sources

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

Reviewed: 23 September 2026