# What Happens During Aircon Servicing? Step-by-Step Checklist

> From quote to test run: the 5-step servicing visit, the full checklist, time for 1-3 units, what to clear beforehand and when you pay.

URL: https://airconservicingserangoon.com/guide/what-happens-general-aircon-servicing/
Last-Modified: 2026-11-11
Author: Brian

![Technician flushing an aircon drain line with a plastic sheet under the unit in an HDB bedroom](/images/featured/technician-flushing-aircon-drain-line-with-plastic.webp)

## The 5-Step Servicing Visit

Here is what is done during aircon servicing at your Serangoon flat, from the first message to the moment you pay. If you have never booked 

aircon servicing in Serangoon

[/ →](/)

 with us before, nothing in the middle will surprise you.

1.  **WhatsApp or call.** Send the number of units, the problem (if any) and your Serangoon address.
2.  **Get a fixed quote and pick a slot.** For general servicing, the price comes straight from our published list. You choose a time, including evenings until 9pm Monday to Saturday and Sundays until 8pm.
3.  **Check and confirm.** The technician arrives, checks each unit and confirms the work with you before starting.
4.  **Clean and test.** The job is done, the area is cleaned up, and each unit is tested.
5.  **Pay after the job.** You pay once you are happy, and your 90-day workmanship warranty starts.

Step 3 matters most. If the technician finds something a general service cannot fix, such as heavy mould or a leaking pipe joint, they tell you and quote it separately before doing anything. Nothing is added to your bill without your say-so.

Our guide on 

what a fixed quote should include

[/guide/fixed-aircon-servicing-quote-what-to-include/ →](/guide/fixed-aircon-servicing-quote-what-to-include/)

 explains how this works.

## The Full Servicing Checklist

Every general service covers the same eight checks on every unit. Use this aircon servicing checklist to see what you are paying for, and to compare with any other quote you get.

| Step | What the technician does | Why it matters |
| --- | --- | --- |
| Filter cleaning | Removes, washes and refits the filters | Restores airflow |
| Evaporator coil | Checks and cleans the coil surface | Helps the unit absorb heat |
| Drain line flush | Flushes the condensate drain line | Prevents leaks |
| Drain pan check | Checks the pan for sludge and cracks | Stops overflow |
| Refrigerant pressure check | Checks the system is running at normal pressure | Spots gas leaks early |
| Thermostat test | Checks the unit responds to the set temperature | Stops over- or under-cooling |
| Electrical check | Looks at wiring and connections | Safety and reliability |
| Airflow and temperature test | Measures the air at the vent | Confirms the unit is cooling |

![Technician reading a thermometer at the aircon vent to test air temperature, homeowner watching](/images/content/technician-reading-thermometer-at-aircon-vent-to-t.webp)

The drain line flush is the one that saves most HDB owners a headache. One Singapore aircon company, Billy Aircon, says a blocked drain pipe is behind over 60% of the leak cases it attends in HDB estates. A clear line is the cheapest leak protection you can buy.

The filter step has a trick of its own. Panasonic Singapore suggests rinsing your own filters every two weeks if you run the aircon daily, which keeps airflow strong between our visits.

### What a general service does not include

A general service does not include a chemical clean of the coil and blower wheel, taking the unit apart, topping up gas, or replacing parts. If a unit needs any of those, the technician explains why and quotes it separately.

Most units on a regular 3-to-4-month cycle only ever need the general service.

## How Long Does Servicing Take?

A general service usually takes about 30 to 90 minutes per unit, depending on the unit and how long since the last clean. Published Singapore guides vary a little. Jex Aircon quotes 30 to 45 minutes per unit, while HomeJourney’s 2026 guide puts a basic service at 45 to 90 minutes.

Three things decide where your visit lands in that range:

-   **Number of units.** Each extra unit adds its own cleaning and testing time.
-   **Type of unit.** Wall-mounted units are the quickest. Ceiling cassette and ducted units take longer because of ladder work and ceiling access.
-   **Time since the last service.** Units that have gone a year or more without care take longer to clean.

For a typical Serangoon flat with 1 to 3 wall-mounted units, the visit fits comfortably into a morning, afternoon or evening slot. We confirm the expected time with your fixed quote, so you can plan around it.

## What to Do Before the Technician Arrives

Clear the space around your units and tell us about any problems. A little preparation makes the visit quicker and cleaner:

-   **Clear the area under each indoor unit.** Move beds, desks and anything fragile about a metre away.
-   **Make the outdoor unit reachable.** Clear plants or storage from the aircon ledge or side passage.
-   **Check condo rules.** Some condos near Lorong Chuan and Upper Paya Lebar need contractor visits booked with the management office. Tell us your condo name and we plan around it.
-   **Note any problems.** A unit that leaks at night or smells at start-up? Tell the technician when they arrive.

![Floor space cleared under a bedroom aircon, ready for the servicing visit](/images/content/cleared-floor-space-under-bedroom-aircon-with-bed-.webp)

## Do You Need to Be Home?

Yes, someone should be home. They let the technician in, confirm the work before it starts, and check the units after testing.

It can be a family member, a helper or a tenant, as long as they can approve the work. If you rent out your flat, just let your tenant know the slot and the quote in advance.

## What the Technician Might Recommend

Most regularly serviced units only need the general service. Sometimes the technician finds something more while the cover is off. These are the most common findings, and what happens next:

| What they find | What it means | What happens |
| --- | --- | --- |
| Heavy grime on the coil or blower wheel | A normal clean will not restore cooling | Chemical wash quoted, from S$80 per unit |
| Black mould, sour smell, jelly sludge | Mould is packed too deep for a wash | Chemical overhaul quoted, S$130-S$180 per unit |
| Low pressure on the gauge | Likely a refrigerant leak | Leak check and top-up quoted, from S$80 |
| Worn capacitor or failing fan motor | A part is near the end of its life | Repair quoted, from S$60, parts upfront |

You decide on each one. If you say no, the technician finishes the general service as agreed, and you pay only the original quote.

Dirty units cost you in other ways too. Singapore servicing firm Prima Services says dirty filters alone can raise a unit’s energy use by 5 to 15 percent, so a recommended clean often pays for itself on the electricity bill.

## After the Visit: What to Watch For

Most changes in the first few days are normal, and a few are worth a message to us. Here is how to tell them apart:

-   **Normal:** a faint clean smell at start-up, stronger airflow than before, and more water dripping from the outdoor drain outlet as the cleared line flows freely.
-   **Worth a message:** a new drip from the indoor unit, a new rattle from a cover, or cooling that is weaker than before the visit.

Anything linked to the work we did is covered by the 90-day workmanship warranty, so tell us early.

## Paying and the 90-Day Warranty

You pay after the job, once each unit has been tested. The work carries a **90-day workmanship warranty**: if the same fault comes back within 90 days, we return and fix it at no extra charge.

> **What it costs**
> 
> General servicing is S$50 for 1 unit, S$55 for 2, S$70 for 3 and S$85 for 4, with no callout fee for Serangoon.

## Ready to Book?

The quickest way is WhatsApp: send your units, the problem and your address, and we reply with a fixed quote and slot options. You can also 

book a slot

[/contact/ →](/contact/)

 through our contact form.

Now you know what is done during aircon servicing, so there is nothing left to guess on the day. Once the first service is done, we recommend servicing every 3 to 4 months to keep your units running well.

Got Questions?

## Questions People Also Ask

### How long does servicing take for 3 units?

It depends on the unit type and condition. Wall-mounted units in good condition are quicker than cassette units or units that have gone a long time without a service. The technician confirms the expected time with your fixed quote.

### Will the job be messy?

No. The area under each unit is sheeted before work starts, and the technician cleans up after the job. Each unit is tested before we leave.

### Do I pay before or after?

After. You pay once the job is done and every unit has been tested. Your 90-day workmanship warranty starts from that visit.

### Do I need to be at home?

Someone should be home to let the technician in, confirm the work before it starts and check the units after testing. It does not have to be the owner, as long as they can approve the work.

## Related Guides

![Person rinsing an aircon filter under the kitchen tap in a Singapore flat, with the filter frame on a drying rack](/images/featured/person-rinsing-aircon-filter-under-kitchen-tap-in-.webp)

### Cleaning Aircon Filters Yourself vs Calling a Technician

[Cleaning Aircon Filters Yourself vs Calling a Technician →](/guide/clean-aircon-filter-yourself-vs-technician/)

![Homeowner reading an aircon servicing quote in a WhatsApp chat beside a wall-mounted unit](/images/featured/homeowner-reading-aircon-servicing-quote-on-phone-.webp)

### What a Fixed Aircon Servicing Quote Should Include

[What a Fixed Aircon Servicing Quote Should Include →](/guide/fixed-aircon-servicing-quote-what-to-include/)

![Technician cleaning the filter of a wall-mounted aircon in an HDB bedroom, with a ladder and toolbox on the floor](/images/featured/technician-cleaning-filter-of-a-wall-mounted-airco.webp)

### How Often Should You Service Your Aircon in Singapore?

[How Often Should You Service Your Aircon in Singapore? →](/guide/how-often-service-aircon-singapore/)

![A hand feeling weak airflow from a wall-mounted aircon vent in a Singapore living room](/images/featured/hand-feeling-weak-airflow-from-a-wall-mounted-airc.webp)

### Signs Your Aircon Is Due for Servicing

[Signs Your Aircon Is Due for Servicing →](/guide/signs-aircon-due-for-servicing/)

From guide to booking

## Learn more about General Aircon Servicing

Filter, coil and drain cleaning with a full check and test. From S$50 for 1 unit, fixed quote first, no callout fee, 90-day workmanship warranty.

See General Aircon Servicing

[/ →](/)

 

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