.jpg&w=256&q=75 "Repair Service (Window AC)")
.jpg&w=256&q=75 "Repair Service (Split AC)")
.jpg&w=256&q=75 "Installation (Window AC)")
.jpg&w=256&q=75 "Installation (Split AC)")
.jpg&w=256&q=75 "Gas Filling (Window AC)")
.jpg&w=256&q=75 "Gas Filling (Split AC 1.0 Ton)")
Many Darbhanga Families Think an AC Only Needs Gas Once a Year. It Should Not Need Gas at All.
Ask around in Darbhanga and you will hear the same advice: before summer, call the mechanic and get the AC's gas filled. It sounds like routine maintenance, like topping up engine oil. It is not. The refrigerant in an air conditioner runs in a closed, sealed loop. It does not burn, evaporate away or get used up. If an AC needs gas every year, it is leaking, and filling it without finding the leak just means paying for the same gas to escape again by August.
In Darbhanga, those leaks have particular causes: humid air corroding copper joints, outdoor units shaken loose on old walls, and installation shortcuts. This page goes through the city's year season by season, showing what goes wrong with ACs in each and what a proper AC service in Darbhanga from AC Care India involves.
February and March: The Window Most People Miss
The fog of January has lifted, the mornings are pleasant, and nobody is thinking about air conditioning yet. That is exactly why this is the best time to service it. Technicians are available, parts are in stock, and any fault found can be fixed without the family sweating through a broken AC in May.
What to get done
- A full indoor and outdoor coil clean, since the outdoor unit has been collecting dust, soot and bird droppings all winter.
- A check of the drain line, which can be blocked by insects and dirt during months of disuse.
- A pressure test to see whether refrigerant has leaked over the off-season.
- An electrical check of the capacitor, contactor and wiring, which may have corroded in the damp winter fog.
April to June: Heat That Does Not Let Up at Night
Darbhanga's summer is not as dry as Rajasthan's, but it is relentless. Daytime temperatures often approach or cross 40°C in May and June, and the air carries more moisture than in south Bihar, so the nights stay warm and sticky. An AC here works hard for long hours, often through the night.
What goes wrong
- Capacitors weaken and fail under constant starts, especially when voltage drops in the evening peak.
- Condenser coils clogged with dust and pollen cause high pressure, so the compressor overheats and trips.
- Outdoor units mounted in direct afternoon sun on rooftops or west-facing walls struggle to reject heat.
- Pre-monsoon thunderstorms and lightning cause surge damage to PCBs, particularly on inverter models.
What we do
Capacitor and current tests, condenser washing, voltage checks with advice on stabilisers, and PCB diagnosis after storms.
July to September: Monsoon, Humidity and Flood Worries
The monsoon in Darbhanga is heavy and long, and the low-lying parts of the city and surrounding blocks are prone to waterlogging and, in bad years, flooding from the Kamla, Bagmati and other rivers. Humidity stays near saturation for weeks.
What goes wrong
- Drain lines overflow and water drips from indoor units.
- Mould grows in the indoor coil and blower, producing a musty smell when the AC starts.
- Outdoor units on ground level or low terraces can be partly submerged when lanes waterlog, damaging fan motors and electrical parts.
- Moisture creeps into terminals, contactors and outdoor PCBs, causing intermittent faults.
What we do
Drain flushing and slope correction, anti-fungal coil and blower cleaning, inspection of any unit exposed to floodwater before it is switched back on, and drying and protecting electrical parts. Never run an outdoor unit that has been under water until it has been checked.
October and November: The Second Summer and the Festival Season
After the rains withdraw, October can be surprisingly warm and humid. Durga Puja, Diwali, Chhath and Sama-Chakeva bring guests and long evenings, and the AC is used again in drawing rooms and bedrooms.
What goes wrong
- Coils that collected grime and mould through the monsoon now cool poorly.
- Remote and display faults appear on boards that took in moisture.
What we do
A post-monsoon coil clean and electrical check, and a final look at the outdoor bracket and mounting before the unit sits idle for winter.
December and January: Fog, Cold and Hot-and-Cold Units
Winter in Darbhanga brings dense fog and cold waves, with nights dropping to single digits. Most ACs are switched off. Homes with hot-and-cold split units use the heating mode, which runs the cycle in reverse and has its own faults, such as reversing valve problems and outdoor coil icing.
For cooling-only units, cover the outdoor unit loosely with breathable fabric, never with plastic that traps moisture, and run the AC in fan mode for a few minutes every two weeks so the blower bearings do not seize.
Where Darbhanga's AC Leaks Actually Come From
Since the myth at the top of this page is so widespread, it is worth explaining where the leaks we find usually are.
Flare joints made in a hurry
The copper pipes between indoor and outdoor units are joined with flared ends tightened onto brass nuts. If the flare is cut unevenly, tightened without a torque wrench or left without leak testing, it seeps slowly. Much of the gas loss we see in Darbhanga traces back to installation, not age.
Humidity and corrosion
Months of near-saturated air, plus water dripping onto pipes from poorly sealed insulation, slowly corrode copper and the brazed joints at the service valves. Pinholes form, often just behind the insulation tape where nobody looks.
Vibration on old walls
Many houses in older parts of the city, around Lalbagh, Urdu Bazaar and the Raj area, have outdoor units bolted onto aged brick or plaster. Over time the brackets loosen, the unit vibrates, and the pipes crack where they bend. On newer apartment blocks near Laheriasarai and Donar, the issue is more often units squeezed into narrow ledges with no space to breathe.
A leak repair means locating the fault with nitrogen pressure and a detector, fixing the joint or brazing the pinhole, then pulling a deep vacuum and charging the correct weight of gas. Done properly once, it should not need repeating every summer.
AC Problems Across the Year: Cause and Season
| Problem | Common cause | When it peaks in Darbhanga |
|---|---|---|
| Weak cooling | Dirty coils, leaking refrigerant, high outdoor heat | May to June |
| Compressor starts and stops | Weak capacitor, low voltage, overheated condenser | Summer evenings |
| Water leaking indoors | Blocked drain pipe, poor slope | Monsoon |
| Musty smell | Mould on coil and blower | Monsoon and October |
| AC dead after storm | PCB or fuse damaged by surge | May to July |
| Gas needed every season | Corroded joint or coil leak never repaired | Discovered each summer |
| Heating not working on hot-and-cold units | Reversing valve, sensor fault | Winter |
Our 10-Step AC Service Checklist
- Measure supply voltage and check the stabiliser.
- Record the compressor's running current.
- Remove, wash and dry the filters.
- Clean the indoor coil and blower wheel with a proper coil cleaner.
- Wash the outdoor condenser with a pressure jet and comb bent fins.
- Flush the drain line and check its slope.
- Check refrigerant pressure and, if low, find and repair the leak before charging by weight.
- Test the capacitor, contactor, fan motors and sensors.
- Tighten terminals, check earthing and inspect copper pipe insulation.
- Measure air temperature at the outlet and explain the readings to you.
What We Will Not Do
- Top up gas without checking for a leak.
- Replace a compressor when a capacitor or relay is the actual fault.
- Call ourselves an authorised brand service centre.
- Begin any repair before you have approved the cost.
- Switch on an outdoor unit that has been under floodwater before it is inspected.
Where We Work in Darbhanga
We cover Laheriasarai, Lalbagh, Benta, Donar, Kadirabad, Allalpatti, Shubhankarpur, Bela, Mirzapur, Bahadurpur, Gangwara, Hasanchak, Chunabhatti, Delhi Mor, Kathalbari, Mabbi, Bhatiyari Sarai, Urdu Bazaar, Tower Chowk and the DMCH area, along with offices and shops on the Darbhanga–Laheriasarai stretch.
AC Brands We Repair
We regularly work on Voltas. We also service Daikin, Samsung, Lloyd, Blue Star, Hitachi, Panasonic, Carrier, O General, Godrej, Whirlpool and Haier, including inverter, hot-and-cold, window and cassette models.
Book an AC Service in Darbhanga
With AC Care India, you get trained and verified technicians, a clear estimate before work begins, a warranty on repairs and the parts we fit, genuine or quality-checked spares, and same-day or next-day visits in most parts of the city. If your AC is better replaced than repaired, we will say so.
Call 9266608882 or book online through this page.
AC Care India is an independent multi-brand AC service company and is not the authorised service centre of any manufacturer. Brand names are used only to identify the ACs we work on. For ACs under company warranty, contact the brand first.
