Needed to replace the two speed power switch on my Hayward two speed pump on a cartridge filter for an above ground pool - the pump is rated at 14.5 /3.3 amps IIRC, and spends 24/7 on the low speed setting. Could not easily find a SPDT switch rated for 20 amps that would fit under the motor switch cover, so I replaced the switch with a SPDT rated at 10 amps on 120 volts.
At the same time, I replaced the electrical cord running to this pump - former owner had used 75 feet of 16 gauge cord, I replaced that with 50 feet of 12 gauge and 8 feet of 14 gauge. the old cord woud actually get warm if the pump was run on the high setting for more than a few minutes.
Now, the pump seems to run much warmer on the low setting - almost too warm to touch. On high setting, the thermal switch cuts the motor out after about 2 minutes, then it resets after cooling a bit.
This is an AO Smith motor that is likely 8 or so years old - it has been trouble free for the 5 summers I have run it. since it is obviously running hotter than it has previously, could the lower-rated switch be a culprit? Obviously voltage issues are the most common reason for hot running motors, but I thought I had bypassed that when upsizing the feed line.
Happy to find this forum, and I appreciate the feedback!