We had a lot of rain lately and all of a sudden, the main breaker of the pool pump keeps tripping. I had the pool man check it and he said it's not the motor. We changed the breaker and it still trips the main breaker that has the 40 amps instead of the 20 that is located near the pool pump. any ideas?
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Get a new electrician! The pool pump should be on its own isolated circuit, usually on no larger than a 30 amp GFCI protected breaker. You said it was replaced but he only treated the symptom, not the cause. This one will take on site troubleshooting to find out why your whole house is affected.
Water sprayed on the pump occasionallyshouldn't hurt it but it might cause a ground fault circuit interupter (GFCI) to trip. If you turn on the pump and literally nothing happens then most likely the the GFCI has tripped. If it hums then this is a different issue. If you have a volt meter you can open the timer box and check whether power is available to the timer. If no power is available in the timer then it confirms that the pump is probably ok. Checking your circuit breaker panel for a tripped breaker or finding a tripped GFCI then either one can be reset and your pump will probably run without a problem.
two main reasons breaker trips is the pump motor jammed [not turning]or the heater shorted out --disconnect power open access panel disconnect the lines to the heater turn on power if breaker trips than motor /pump problem if doesnt trip than heater problem can order heater replacement online or pool spa store--if motor pump check pump for debris and motor for lube if u can turn shaft or impeller oil motor and work it into bearings if still not turning possible need to replace motor unit
GFI devices are prone to degrade over time. Also, when used outdoors there are additional moisture issues that may cause sufficient current leakage to trip the breaker.
I had a similar problem this Spring. I was using a 20 amp GFI "master" outlet that protected two additional outlets 'downstream' of it (wired to the 'load' terminals on the GFI outlet- I'd have the check the doc. to see what terminology was used here). The pump was plugged into one of the downstream outlets.
Replacing the GFI seemed to solve the problem. I did ante up $20 for an 'outdoor' model of the 20 amp GFI unit, several bucks more than the standard 'indoor' unit - have no ideal if that represented additional value or not.
Note also, that this is the third such pump I have used for my pool cover. The other two failed to come on at all after about a year's use. The mfg replaced them under warranty (I may have had to send back the old pump - I forget!).