Fault Phenomenon: Co-Nele KNL5300 remote control functions normally when cold. With the receiver under direct sunlight (operating temperature), the remote control distance shortens, signal is intermittent, and eventually fails.

Troubleshooting Process:
– Checked remote control battery: power sufficient.
– Checked receiving antenna: antenna connection secure.
– Checked for surrounding interference: no strong electromagnetic interference sources.
– Measured receiver supply voltage at operating temperature: found voltage fluctuates.

Root Cause: The internal voltage regulator module in the receiver overheats, causing unstable operating voltage.

Required Parts: Wireless remote receiver box assembly.