Give the technician the installation history
Be direct about the work you did and which parts another provider handled. Gather the purchase records, indoor and outdoor model numbers, refrigerant-line length, manuals, permit records, and any startup or test results you actually have. If a test was not performed or recorded, say so. Guessing at a result makes the investigation harder.
Describe whether the system ever cooled well, when ice first appeared, where the water came from, and which mode and fan setting were in use. Existing photos are helpful. Do not run it again to collect them. From outside the equipment, note any furniture or belongings blocking its air path, but leave internal inspection to the technician.
Ask for an installation assessment, not just a refill
We would want the technician to confirm the installed equipment combination and inspect the work against its manuals. Ask them to assess airflow, drainage, electrical installation through the appropriate qualified provider, and the refrigeration system. For any proposed repair, request the finding and measurements that support it.
If refrigerant correction is proposed, ask why it is needed and whether the technician found a leak, installation error, or another supported cause. If a drain correction is proposed, ask how it relates to the ice and how both problems will be tested afterward. One corrected symptom should not end the visit while the other remains unexplained.
Before booking, confirm whether the provider accepts owner-installed systems, what their diagnostic scope includes, and what correction work they are prepared to own. Warranty eligibility also needs its own written confirmation; a repair visit does not establish it automatically.
Your next step: Leave cooling off and send the equipment and installation records to a qualified technician. Get a written diagnosis, correction scope, and completed operating and drainage checks before normal use resumes.