Does this mean the service caused permanent damage?

No. If your unit stopped cooling right after servicing, it's almost certainly a service error—a valve left partially closed or a connection not fully tightened. Once we fix it, the unit is fine.

Will I need to buy new parts?

Probably not. Most service-related failures are quick fixes—reopening a valve, retightening a connection. The customer in this case didn't need any parts, just a correction.

How do I know it's the service's fault and not something else breaking?

Timing is the clue. If your unit was working before the service and stopped within a day or two after, the service is the likely cause. Have that path checked first.

Not cold after servicing traced to partially closed valve

Aircon case in Bedok, Singapore: post-service issue traced to service valve left partially closed after routine service after targeted diagnosis checks.

Case details

What client reported

The aircon was fine before the servicing two days ago. Now it's blowing air but it's completely warm. It was working perfectly before they came.

ProblemPost-service

UnitDaikin · Wall-mounted · 10 years old

LocationHDB · Bedok, Singapore

What we found

When servicing causes immediate failure, the service itself is the first thing to check. We started with the valve positions and cooling circuit.

Compressor was running normally with no overheating signs
Refrigerant pressure looked normal at the gauge
Found an outdoor service valve not fully reopened after servicing
Restricted refrigerant flow was blocking normal cooling

During a routine service, technicians sometimes close valves to check pressure or isolate the indoor unit. The valve must be fully reopened after. In this case, it was left partially closed. Enough for the system to run, but not enough for gas to flow properly.

What we did

Fully reopen the valve, then verify if cooling returns. If cooling normalises, no parts are needed. If not, continue diagnosis from there.

We opened the valve fully. Within minutes, the unit was blowing cold air. Temperature drop measured normal. No parts were needed.

Timeline

Day 1

Unit stopped cooling 2 days after routine service

Day 2

Checked service valve positions first, then traced the cooling circuit

Day 2

Found service valve left partially closed, reopened it—cooling restored

What we learned

Why some problems happen right after servicing.

Service involves opening the cooling circuit—valves, connections, filters
If a valve gets left partially closed or a connection loosened, cooling fails immediately
This is a service error, not a compressor failure, and it's usually a quick fix

Common questions

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