- Heat pumps
- Air-to-water heat pump
7H-06
Daikin Altherma 4 H F 7H-06: Abnormal flow during cooling operation
Risk level
High
Professional inspection is recommended.
Urgency
High
Quick answer
7H-06 means “Abnormal flow during cooling operation” on the scoped Altherma 4 H F family. Daikin records this trigger: Minimum flow requirement during cooling on the emitter circuit was not reached. Effect: Heat pump will stop operating. The table marks the reset as manual.
Safety first
Stop and check this first
- Stop and isolate the installation for smoke, burning smell, sparks, unusual heat, water near electrical parts, suspected refrigerant release or repeated protective trips. Do not open the R290 refrigerant circuit or live electrical compartments.
Safe checks you can perform
- Preserve the diagnostic state
- Use the displayed reset path once
- Check only user-visible water-circuit evidence
Leave these tasks to a qualified professional
- Do not attempt this professional task: Measured handoff for 7H-06
What a technician must be able to justify
A technician is coming
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Measured handoff for 7H-06
What they doGive the technician 7H-06, both model numbers, the source trigger “Minimum flow requirement during cooling on the emitter circuit was not reached”, the effect “Heat pump will stop operating”, reset result and recurrence conditions. They should follow Daikin's water flow and pump branch and compare live measurements with the service values before replacing parts.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Checks and evidence, step by step
Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
- 1
Preserve the diagnostic state
No special tools
Procedure
Photograph 7H-06 and the complete display. Record both unit model numbers, operating mode, requested temperatures, weather, system pressure shown to the user and the moment the code appeared.
Stop and isolate the installation for smoke, burning smell, sparks, unusual heat, water near electrical parts, suspected refrigerant release or repeated protective trips. Do not open the R290 refrigerant circuit or live electrical compartments.
Evidence: Daikin Altherma 4 H F installer reference guide — 4PEN773391-1C
- 2
Use the displayed reset path once
No special tools
Procedure
Daikin marks this code as manual reset. Only when the installation is safe, follow the reset instruction shown by the user interface or the exact user manual once. Do not enter maintenance mode; recurrence ends user troubleshooting.
Stop and isolate the installation for smoke, burning smell, sparks, unusual heat, water near electrical parts, suspected refrigerant release or repeated protective trips. Do not open the R290 refrigerant circuit or live electrical compartments.
Evidence: Daikin Altherma 4 H F installer reference guide — 4PEN773391-1C
- 3
Check only user-visible water-circuit evidence
No special tools
Procedure
If the user manual permits it, read the displayed system pressure, confirm no user-accessible valve was accidentally closed and look for a visible leak. Do not fill, bleed, clean strainers or measure flow unless the exact user manual assigns that task to the user.
Stop and isolate the installation for smoke, burning smell, sparks, unusual heat, water near electrical parts, suspected refrigerant release or repeated protective trips. Do not open the R290 refrigerant circuit or live electrical compartments.
Evidence: Daikin Altherma 4 H F installer reference guide — 4PEN773391-1C
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Heat pumps
- Brand
- Daikin
- Product type
- Air-to-water heat pump
Known code variants
- Altherma 4 H F 7H-06
- code erreur Daikin Altherma 7H-06
- codice 7H-06 pompa di calore Daikin
- código 7H-06 bomba de calor Daikin
- Daikin 7H-06
- Daikin Altherma error 7H-06
- Daikin Altherma Fehler 7H-06
- Daikin heat pump code 7H-06
- Daikin Wärmepumpe Fehlercode 7H-06
- défaut 7H-06 pompe à chaleur Daikin
- error Daikin Altherma 7H-06
- errore Daikin Altherma 7H-06
What it means
In guide 4P773391-1C (2026.02), Daikin assigns 7H-06 to “Abnormal flow during cooling operation”. The documented trigger is “Minimum flow requirement during cooling on the emitter circuit was not reached” and the operating effect is “Heat pump will stop operating”. This is a precise controller decision for Daikin Altherma 4 H F — EPSK(S)04~14A + EPVX07~14S18+23A; it does not by itself prove which component failed.
Warnings and stop conditions
- Highsource verified
Stop and isolate the installation for smoke, burning smell, sparks, unusual heat, water near electrical parts, suspected refrigerant release or repeated protective trips. Do not open the R290 refrigerant circuit or live electrical compartments.
Evidence: Daikin Altherma 4 H F installer reference guide — 4PEN773391-1C
Symptoms and causes
Probable causes · in order
- What the controller establishedConfirmed
Daikin's table defines the condition as “Abnormal flow during cooling operation” and gives this exact trigger: Minimum flow requirement during cooling on the emitter circuit was not reached.
Evidence: Daikin Altherma 4 H F installer reference guide — 4PEN773391-1C
- What the unit does nextConfirmed
Documented effect: Heat pump will stop operating. Reset classification: Manual. A cleared display is not proof of repair.
Evidence: Daikin Altherma 4 H F installer reference guide — 4PEN773391-1C
Virtual technician
Does 7H-06 still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
Daikin Altherma 4 H F installer reference guide — 4PEN773391-1C
Daikin Europe N.V. · 2026 · official_doc
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