Voltas AC Error Code F2 — What It Means & How to Fix It

What Does This Error Mean?

F2 on a Voltas AC means the indoor coil (evaporator pipe) temperature thermistor has a fault. This sensor monitors the evaporator coil temperature to prevent ice formation and regulate the refrigerant cycle. F2 triggers a shutdown to prevent the coil from freezing solid.

Affected Models

Voltas Inverter Split AC (all capacities)
Voltas 3 Star Inverter
Voltas 5 Star Inverter
Voltas Adjustable Inverter
Voltas SAC series

Common Causes

Indoor coil thermistor failed — open or short circuit
Thermistor probe dislodged from the evaporator coil pipe
Air filter blocked — coil over-cools and sensor reads at fault threshold
Refrigerant overcharge causing the coil to be excessively cold
Indoor PCB fault causing incorrect thermistor reading

How to Fix It

Clean the air filter immediately — this is the most common cause.

Remove the front panel, slide out the filter, wash it under a tap and let it dry. A severely clogged filter cuts airflow over the coil and causes it to over-cool.
Switch off for 10 minutes to allow any ice on the coil to melt, then restart.

If the coil had started to freeze, running immediately will trigger F2 again. Give it time to defrost fully.
Restart and monitor — if F2 clears with a clean filter and does not return, the filter was the problem.

If F2 returns despite a clean filter, the thermistor or refrigerant charge needs professional attention.
Call Voltas service (1800-209-2000) if F2 persists after filter cleaning.

The technician will test thermistor resistance and check system operating pressures.

When to Call a Professional

F2 requires a Voltas authorised technician. Voltas customer care: 1800-209-2000. A technician will test the coil thermistor and check refrigerant charge if needed.

Frequently Asked Questions

How do I know if my Voltas AC coil has frozen?

Signs of a frozen coil: ice visible on the indoor unit pipes or around the front panel, water dripping heavily from the unit, weak or no airflow despite the fan running, and warm air coming out despite the AC being on. If you see any of these signs, switch off the AC and let it defrost for at least an hour before restarting.