❄️Mini Split

Daikin · 4MXS36RMVJU 36,000 BTU Multi-Zone Mini Split System with Heat Pump and WiFi Control

Daikin 4MXS36RMVJU 36,000 BTU Multi-Zone Mini Split System with Heat Pump and WiFi Control U2 Error Fix: Power Supply Voltage Abnormal

Power supply voltage drop or main circuit overvoltage — the supply voltage is outside the acceptable operating range, causing the unit to shut down for protection

Medium severity2 fixes available✨ Free fix available

Quick Answer

Error U2 on the Daikin 4MXS36RMVJU 36,000 BTU Multi-Zone Mini Split System with Heat Pump and WiFi Control means: Power Supply Voltage Abnormal. The top-ranked community fix is “Inspect and Repair Power Supply Wiring and Replace Voltage Protection Components” (medium difficulty, ~90 min, DIY cost: $10-$30). 2 community-ranked fixes available below.

Published February 2026 · 2 fixes · mini split

Content is based on manufacturer service documentation, community repair experience, and OEM technical bulletins. Always verify with your owner's manual.Learn about our editorial standards.

When to Call a Professional

While many mini split repairs can be done safely at home, consider hiring a qualified technician if:

The repair involves electrical wiring, gas lines, or refrigerant
You've tried the top-ranked fix and the error persists
You smell gas, see sparking, or notice water leaking
The repair requires specialized tools you don't have
Your appliance is still under manufacturer warranty

Average professional repair cost for this issue: $200-$350.

Other Daikin Models with Error U2

FTXS12LVJU 12,000 BTU Wall Mount Mini Split Indoor Unit with Inverter and Quiet Operation

mini_split · 2 fixes

RXB12AXVJU 12,000 BTU Outdoor Mini Split Heat Pump Unit with Durable Compressor

mini_split · 2 fixes

Other Daikin 4MXS36RMVJU 36,000 BTU Multi-Zone Mini Split System with Heat Pump and WiFi Control Error Codes

External Protection Device Activated

2 fixes

Indoor Unit PCB Defect

2 fixes

Drain Level System Malfunction

2 fixes

Anti-Freeze Protection Activated

2 fixes

Indoor Fan Motor Malfunction

2 fixes

Swing Flap Louver Motor Malfunction

2 fixes

Air Filter Clogging Detected

2 fixes

Liquid Pipe Temperature Sensor Malfunction

2 fixes

People Also Ask About Daikin 4MXS36RMVJU 36,000 BTU Multi-Zone Mini Split System with Heat Pump and WiFi Control Error U2

What does error code U2 mean on a Daikin 4MXS36RMVJU 36,000 BTU Multi-Zone Mini Split System with Heat Pump and WiFi Control?

Error code U2 on the Daikin 4MXS36RMVJU 36,000 BTU Multi-Zone Mini Split System with Heat Pump and WiFi Control means: Power Supply Voltage Abnormal. Power supply voltage drop or main circuit overvoltage — the supply voltage is outside the acceptable operating range, causing the unit to shut down for protection

How do I fix error code U2 on my Daikin 4MXS36RMVJU 36,000 BTU Multi-Zone Mini Split System with Heat Pump and WiFi Control?

The most successful fix is "Inspect and Repair Power Supply Wiring and Replace Voltage Protection Components" (medium difficulty, ~90 minutes). Estimated DIY cost: $10-$30. HomeMD has 2 community-ranked fixes for this error.

Is error code U2 on a Daikin 4MXS36RMVJU 36,000 BTU Multi-Zone Mini Split System with Heat Pump and WiFi Control serious?

This error is rated medium severity. It should be addressed soon, but your appliance may still function in a limited capacity.

Can I fix Daikin 4MXS36RMVJU 36,000 BTU Multi-Zone Mini Split System with Heat Pump and WiFi Control error U2 myself?

Yes — the top-ranked community fix ("Inspect and Repair Power Supply Wiring and Replace Voltage Protection Components") is rated medium difficulty and takes about 90 minutes. Tools needed: T20 Torx screwdriver, Digital multimeter, Insulated pliers.

How much does it cost to repair Daikin 4MXS36RMVJU 36,000 BTU Multi-Zone Mini Split System with Heat Pump and WiFi Control error U2?

DIY cost: $10-$30. Professional repair typically costs $200-$350. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the Daikin 4MXS36RMVJU 36,000 BTU Multi-Zone Mini Split System with Heat Pump and WiFi Control have?

The Daikin 4MXS36RMVJU 36,000 BTU Multi-Zone Mini Split System with Heat Pump and WiFi Control has 8 other known error codes, including: A0 (External Protection Device Activated), A1 (Indoor Unit PCB Defect), A3 (Drain Level System Malfunction), A5 (Anti-Freeze Protection Activated), A6 (Indoor Fan Motor Malfunction), and 3 more.

Which other Daikin models have the U2 error?

Error code U2 also appears on 2 other Daikin models: FTXS12LVJU 12,000 BTU Wall Mount Mini Split Indoor Unit with Inverter and Quiet Operation, RXB12AXVJU 12,000 BTU Outdoor Mini Split Heat Pump Unit with Durable Compressor. The fix may vary by model, so check each model's specific page for tailored repair steps.

What other error codes does the Daikin 4MXS36RMVJU 36,000 BTU Multi-Zone Mini Split System with Heat Pump and WiFi Control have?

The Daikin 4MXS36RMVJU 36,000 BTU Multi-Zone Mini Split System with Heat Pump and WiFi Control has 8 other known error codes:

A0 — External Protection Device Activated (2 fixes)
A1 — Indoor Unit PCB Defect (2 fixes)
A3 — Drain Level System Malfunction (2 fixes)
A5 — Anti-Freeze Protection Activated (2 fixes)
A6 — Indoor Fan Motor Malfunction (2 fixes)
A7 — Swing Flap Louver Motor Malfunction (2 fixes)
AH — Air Filter Clogging Detected (2 fixes)
C4 — Liquid Pipe Temperature Sensor Malfunction (2 fixes)

Which other Daikin models have the U2 error?

Error code U2 also appears on 2 other Daikin models:

FTXS12LVJU 12,000 BTU Wall Mount Mini Split Indoor Unit with Inverter and Quiet Operation (mini split) · 2 fixes
RXB12AXVJU 12,000 BTU Outdoor Mini Split Heat Pump Unit with Durable Compressor (mini split) · 2 fixes

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