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Ceiling Unit Dripping After Service: Drain Left Loose

An office ceiling unit drips within days of a service, and a tray replacement is quoted. What to check before accepting that.

By Team Snowflake | Updated 24 Aug 2026

Teaching case based on recurring Snowflake service patterns; identifying details are combined.

How this presents

Dry for months, then dripping onto the carpet within hours of a quarterly service. Nothing about the room or the load changed in between, and the only event inside that window is the visit itself.

Setup
Mitsubishi Electric Ceiling4-6 yearsOfficeMuseum
Misread as
A cracked drain pan, and a tray replacement quote that follows from it.
Check first
The drain connections at the tray outlet, before the tray itself

What else produces this

A unit above a false ceiling drips for one of two reasons: the tray has failed, or the path out of it is not sealed. A failed tray is the expensive reading and the one that gets quoted. The path gets checked first because it is faster, and because servicing this type means opening the drain joint to flush the tray.

  1. A drain nut that turns by hand has not been tightened, and that is visible in seconds.

  2. Water appearing at the fitting rather than anywhere on the tray surface locates the escape precisely.

  3. A tray with no cracks, warping or corrosion, corners included, removes the expensive explanation.

  4. A drain line running free at the discharge point rules out a blockage pushing water back.

Why it happens

The joint at the tray outlet has to come apart for the tray to be flushed, which makes it the one connection routinely disturbed by maintenance. Pushed back into place without being tightened, it holds its shape and seals nothing. Cooling resumes, water collects and runs to the outlet, and leaves at the joint instead of the line. Above a false ceiling that lands on a tile and soaks through, which is what makes a sound tray look like a failed one.

What resolution involves

Reseat and tighten the fitting, then run the unit on cooling long enough to watch the connection stay dry. Twenty minutes is enough for water to reach the joint under normal load. No parts follow: no tray, and no work above the access panel. The one thing worth doing afterwards is telling whoever services it next, so the joint is on the list rather than rediscovered.

How to tell it worked

A tightened joint stops the drip immediately, not gradually. Water that keeps arriving after the connection is sealed means the escape is somewhere else, and only then is the tray a fair question.

Before you approve a quote

A drip right after a service points back to the service

  • Timing is the evidence. A unit dry for months that drips hours after a visit was disturbed during it.
  • Flushing the tray means opening the drain joint. A joint that is not retightened leaks there first.
  • Ask for the connection to be checked before accepting a tray replacement. One costs nothing and the other does not.

Questions this case answers

Ceiling unit dripping within hours of a service visit: coincidence?
Very rarely. A unit that stayed dry for months and starts dripping the same afternoon as a visit was disturbed during that visit. The drain joint is the connection that routinely comes apart for cleaning, which makes it the first thing to check and the cheapest thing to correct.
Does servicing a ceiling unit involve opening the drain?
Usually, yes. The tray cannot be flushed properly with the joint still made up, so it is taken apart and put back. That is normal and not a fault in itself. What matters is whether the nut was tightened on reassembly, because a fitting only pushed home holds its shape and seals nothing.
How do I tell an overflowing pan from a loose fitting?
By where the water is. A fitting that is not sealed leaks at the connection, with the tray surface dry either side of it. An overflowing or failed tray wets the tray itself and usually shows a blockage downstream. Checking the discharge point settles the second half of that in a minute.
Water is soaking through the ceiling tile. Does that mean the pan is damaged?
Not on its own. A unit above a false ceiling drips onto the tile whatever the source, so the tile tells you there is water and nothing about where it came from. A tray with no cracks, warping or corrosion at the corners and the outlet is sound, and the leak is upstream of that.

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