Original complaint
Water leakage returned the day after drain-pan support and pitch were adjusted.
- Pan overflow increased on the return visit
- The connected main drain was restricted
- Drain cleared after repeated clearing attempts
Measurements taken
- Return-visit observation
- No further overflow during the day's monitoring
Diagnostic process
- 1Initially adjusted the pan support and pitch toward the outlet, then observed dry operation
- 2Returned after leakage recurred and found the pan overflowing
- 3Disconnected the main drain from the pan and cleared a restriction
- 4Monitored the unit through the service day for another overflow
- 5Recommended plumbing investigation if the shared drain restriction returns
Finding / confirmed status
A drain restriction was confirmed on the return visit. Whether the connection was the low point collecting sludge from other equipment was a suspicion, not an established cause.
Repair / action taken
Adjusted pan support and drainage pitch on the initial visit, then cleared the connected drain restriction on the return visit.
Final operating readings
- Overflow during monitoring
- Not observed after clearing
- Long-term result
- Follow-up still required
Technician notes
A dry pan at departure proves only the observed interval. Recurrent overflow warrants checking the full drain path and shared connections. This case deliberately omits a clearing-pressure recipe: drain components and building connections require an appropriate, controlled method.
- Check both pan geometry and downstream drainage
- Document suspected shared-drain causes separately from confirmed restrictions
- Escalate recurring building-drain problems for further investigation
Safety cautions
- Protect occupied areas and electrical components from water
- Use a drain-clearing method appropriate for component ratings and connected piping
Safety note
HVAC work can involve high voltage, rotating equipment, pressurized refrigerants, and combustion systems. Use this site as a reference only. Follow the equipment manual, applicable codes, PPE, lockout/tagout, and current refrigerant rules. Field cases and troubleshooting paths are case-specific and are not OEM procedures or universal targets.