AC PCB Relay 4 Leg 25 Ampere 250 Voltage (2 Pcs) PCB relay used in Multi application SANYOU relay (Match And Buy)

A control board carries mains voltage and drives the compressor. If the wrong board is fitted, or a connector goes back one position out, the damage is usually not recoverable. We recommend an AC technician for this part.

1. Confirm the board is actually the fault before replacing it. A dead indoor unit is more often a blown fuse, a failed transformer or a broken sensor than a failed board.
2. Match the board to your exact model. Compare the part number printed on the board itself, not just the AC model — manufacturers change boards mid-production and they are not interchangeable.
3. Isolate at the MCB and allow the unit to sit before opening it.
4. Photograph every connector before you unplug anything. Photograph each one individually and in close-up. Connectors are often the same shape and different function, and this photo is the only reliable record.
5. Note the DIP switch or jumper settings on the old board and set the new one to match. A correct board with the wrong configuration behaves like a faulty one.
6. Transfer connectors one at a time, old board to new, so nothing can be misplaced.
7. Check nothing is left unplugged against your photos before restoring power.

If the new board fails immediately, switch off — that indicates a short elsewhere, most often a failed motor or a pinched loom.