What the inspection must establish

Start with the unit make and model, its coil type and the complaint: weak airflow, water, poor cooling or another symptom. Request photos that identify the same coil before and after access, along with notes on contamination, corrosion, fins, connections and surrounding drainage. A covered coil can hide its condition until access is arranged. Do not assume that a dirty surface proves a leak.

The DENAIR field message 11772 recorded a heavily blocked evaporator, a blocked drain and a failed actuator. It expressed concern that the evaporator might be punctured; it did not confirm a puncture or a completed replacement. Those observations could involve more than one cause of the reported problem, so a single “replace coil” line would need a written basis.

Ask for a staged decision

1. Identify what can safely be cleaned and which access or protection is required.

2. Record what remains after cleaning and whether a model-appropriate test is needed.

3. If replacement is proposed, specify the confirmed defect, compatible part, connected works and post-work checks.

Obtain separate prices for approved cleaning and any conditional replacement. The specialist should explain which findings would trigger the second stage. Do not infer a sealed-system fault from the Telegram note or accept a generic coil size without checking the unit documentation.