- Heat pumps
- Air-to-water heat pump
E2-06
Daikin Altherma 4 H F E2-06: Leakage current detection error
Risk level
High
Professional inspection is recommended.
Urgency
High
Quick answer
E2-06 means “Leakage current detection error” on the scoped Altherma 4 H F family. Daikin records this trigger: Electric leakage missing-core error. Effect: Heat pump will stop operating. The table marks the reset as power cycle.
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
- Let the automatic reset logic decide
- Isolate abnormal electrical symptoms
Leave these tasks to a qualified professional
- Do not attempt this professional task: Measured handoff for E2-06
What a technician must be able to justify
Technician visit
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 E2-06
What they doGive the technician E2-06, both model numbers, the source trigger “Electric leakage missing-core error”, the effect “Heat pump will stop operating”, reset result and recurrence conditions. They should follow Daikin's power and electrical protection 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.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Preserve the diagnostic state
Photograph E2-06 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
Let the automatic reset logic decide
Daikin marks this code as automatic reset. Do not cycle breakers or force repeated acknowledgements. Record whether the controller clears it and the exact operating state in which it returns.
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
Isolate abnormal electrical symptoms
Leave the system off after burning smell, heat, noise, sparking or repeated protective trips. Do not open electrical panels, test terminals or repeatedly re-energize the unit.
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
Still not solved
If the error persists, stop here. See what the technician must do and show you.
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 E2-06
- code erreur Daikin Altherma E2-06
- codice E2-06 pompa di calore Daikin
- código E2-06 bomba de calor Daikin
- Daikin Altherma error E2-06
- Daikin Altherma Fehler E2-06
- Daikin E2-06
- Daikin heat pump code E2-06
- Daikin Wärmepumpe Fehlercode E2-06
- défaut E2-06 pompe à chaleur Daikin
- error Daikin Altherma E2-06
- errore Daikin Altherma E2-06
What it means
In guide 4P773391-1C (2026.02), Daikin assigns E2-06 to “Leakage current detection error”. The documented trigger is “Electric leakage missing-core error” 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 “Leakage current detection error” and gives this exact trigger: Electric leakage missing-core error.
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: Power cycle. A cleared display is not proof of repair.
Evidence: Daikin Altherma 4 H F installer reference guide — 4PEN773391-1C
Virtual technician
Does E2-06 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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