Could external factors like power fluctuations or faulty installation contribute to a recurring CH 05 error?

Yes, absolutely. Significant power fluctuations or surges can damage the sensitive electronic components on the PCBs, leading to a CH 05 error. Faulty installation, such as using incorrect gauge wiring, poorly stripped wires, loose terminal connections, or inadequate protection for the communication cable, can also lead to intermittent or recurring CH 05 errors due to poor signal integrity or eventual wire damage.