What does error code 7H u Daikin and how to fix it?

Heating water flow problem (Flow Rate Error). Repair procedure: Clogged magnetic dirt separator filter on the return line, airlocked circuit, or low system water pressure.

What does error code U0 u Daikin and how to fix it?

Low refrigerant pressure / refrigerant shortage. Repair procedure: R32/R410A refrigerant leak or faulty pressure transducer.

What does error code U4 / E7 u Daikin and how to fix it?

Communication error between indoor & outdoor unit / fan motor fault. Repair procedure: Tripped outdoor unit circuit breaker, broken communication cable, or outdoor fan blocked by ice build-up.

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Technical Diagnostics & Fault Codes • Heat Pumps & Air Conditioning (Daikin Altherma)

Daikin Fault Codes U4, U0, E7, 7H, A5, H9 – Error Code Meaning, Troubleshooting & Repair

Complete diagnostic table of the most common faults for Daikin (Heat Pumps & Air Conditioning (Daikin Altherma)) with quick troubleshooting steps and links to replacement parts:

🛠️ Buy Replacement Part (Daikin) → ⚡ Maintenance & Accessories (Daikin) → 🔧 Service Tools & Multimeters →

Error Code Reference Table for Daikin and step-by-step repair procedure:

Error Code	Meaning / Fault Symptom	Most Common Cause & Repair Procedure
7H	Heating water flow problem (Flow Rate Error)	Clogged magnetic dirt separator filter on the return line, airlocked circuit, or low system water pressure.
U0	Low refrigerant pressure / refrigerant shortage	R32/R410A refrigerant leak or faulty pressure transducer.
U4 / E7	Communication error between indoor & outdoor unit / fan motor fault	Tripped outdoor unit circuit breaker, broken communication cable, or outdoor fan blocked by ice build-up.