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Voltas Air Conditioner

Voltas AC P4 error

Inverter board / power module protection / Power supply voltage problem

Needs a technicianReported by one source — verify

Try a reset once. If it comes back, a trained technician should repair it.

Meaning depends on your model

Different Voltas models use this code for different faults. The most commonly reported meanings are below. Check the model number on the sticker of your unit and your user manual to know which one applies.

Possible meaning 1Inverter board / power module protection

Needs a technician

The inverter drive (power module, DC voltage or heat sink) detected a fault and stopped the compressor.

Common causes

  • Voltage spike or unstable supply
  • Outdoor board overheating (poor air flow, very hot day)
  • Failed power module or board parts
  • Compressor wiring problem

Try this at home first

Tick each step as you go

When to call a technician

This needs a trained inverter technician. Users must never open boards or modules.

Possible meaning 2Power supply voltage problem

You can usually fix it

The supply voltage is too low, too high or unstable, so the appliance stopped itself to avoid damage.

Common causes

  • Low or high mains voltage in your area
  • Stabilizer faulty, overloaded or of the wrong rating
  • Loose plug, socket or wiring
  • Short power cut or fluctuation

Try this at home first

Tick each step as you go

When to call a technician

If the socket voltage is normal and the code repeats, have the wiring and board checked by an electrician or technician.

Safety first

Always switch off at the wall socket or MCB before touching any part. Do not open the outdoor unit, control boards or gas pipes yourself — they carry high voltage and pressure.

Frequently asked questions

What does P4 mean on a Voltas Air Conditioner?

Different Voltas models use this code for different faults. The most commonly reported meanings are below. Check the model number on the sticker of your unit and your user manual to know which one applies. Inverter board / power module protection / Power supply voltage problem.

Can I fix Voltas Air Conditioner error P4 myself?

You can try a reset first: Switch off at the MCB for 10–15 minutes. If the code returns, call a technician.

Is it safe to keep using the Air Conditioner with P4?

Avoid repeated restarts; running with this fault can cause more damage.

Other Voltas AC codes

E5 Overcurrent / compressor overload E6 Communication error (indoor ↔ outdoor unit) F1 Indoor room temperature sensor fault / Indoor fan motor fault F2 Indoor coil (evaporator) temperature sensor fault / Outdoor fan motor fault F3 Outdoor air temperature sensor fault / Overcurrent / compressor overload P1 Power supply voltage problem

All Voltas Air Conditioner error codes

Same code on other brands

P4 Inverter heat-sink temperature sensor faultDaikin AC P4 Power supply voltage problemBlue Star AC

Sources

We write every explanation in our own words from these references.

Last checked: 2026-10-20