The Customer's Situation
Mr. Lee Kah Wai manages a logistics warehouse in Glenmarie. The warehouse has an office section cooled by a York 3.0HP ceiling cassette that had been working fine for 3 years. One Monday morning, the unit started showing E6 on its display and kept shutting down after 30 seconds. Staff were working in 34°C conditions with no cooling.
His maintenance team had tried power resets multiple times with no luck. They googled "York E6 error" and found it meant a communication fault, but didn't know how to fix it.
Our Diagnosis
Technician Hafiz arrived and confirmed E6 = communication error between indoor and outdoor units. He traced the signal wire along its route and found the culprit: a junction box where the wire passed through an external wall had accumulated moisture over time. The wire terminals inside were heavily corroded, causing intermittent signal loss. Recent heavy rain had finally corroded the connection enough to fail completely.
For more on understanding error codes, see our aircond error code guide.
Results
- E6 error cleared immediately after wire repair
- Full cooling restored — office back to 24°C within 30 minutes
- Junction box sealed against future moisture
- 30-minute stability test passed — no recurrence
Pricing
- Diagnosis: RM80
- Wire repair + new connectors: RM100
- Signal cable replacement (3m): RM60
- Weatherproofing: RM40
- Total: RM280
Issues Identified
- York 3.0HP ceiling cassette displaying E6 error code
- Unit starts then shuts down after 30 seconds
- E6 = communication error between indoor and outdoor units
- Office area of warehouse reaching 34°C with no cooling
- Error persists after multiple power resets
Work Completed
- Traced signal wire from indoor to outdoor unit — found corroded connection at junction box
- Stripped corroded section and re-terminated with new connectors
- Applied weatherproof sealant to junction box to prevent future moisture ingress
- Replaced damaged signal cable section (3 metres)
- System restarted — E6 error cleared, full cooling restored
- Tested for 30 minutes — stable operation confirmed
Customer Feedback
"My team tried resetting it all weekend. Hafiz found the corroded wire in 20 minutes. Simple fix, but we would never have found it ourselves. Office is cool again and the weatherproofing should prevent this from happening again."
— Mr. Lee Kah Wai, Glenmarie
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