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Spa has 20amp fuse that blows whenever I either restart spa or turn on jet pump. I disconnected pump and it ran fine until I restarted the spa and fuse blew again.

It has new vertical low flow heater and circulation pump.

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Something is drawing a load when it shouldnt be. remove all circ pumps, booster pumps, and disconnect heater element. turn on hot tub and see if it trips. then do the same, re connecting the element, and pumps, one at a time. when it does trip, thats where the problem lies. bad pump or element

Posted on Feb 13, 2014

  • Kev McCauley
    Kev McCauley Jun 24, 2014

    check the total head, (water resistance if a high head si exists it will cause the pump to draw over 20 amps on start up



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SOURCE: pool and spa heater will not turn on, low pressure on display

1) check the fuse on the transformer. You will get "low pressure" if the fuse is blown.
1a) remove front panel with flat head screw driver turning both big screws 1/4 turn clockwise
1b) look up under the 1 remaining front piece for 2 screws (one on each side). remove them and the 1 small panel slides down
1c) transform is directly in the center of this compartment
1d) red wire on transform has a black fuse case - twist open and check fuse (with an ohm meter it should read a dead short if it is working).
1e) if not working - replace with standard 250v 2a bus fuse.
2) it really is low pressure
2a) backwash pool or at least make sure pressure in filter take is not too high (high filter tank pressure == low water pressure in heater)
2b) if you have a bypass valve make sure it is not in bypass mode so most all pressure from the pump is going tothe heater
2c) right next to the transformer is the pressure switch. It has a small copper tube attached to the back and 2 wires in the front. Put an ohm meter across the two leads on this device. With the filter off it should be open, with the filter on it should be closed (short). If not either the copper tubing is clogged, the switch is faulty, or there is not enough water going through the heater. The amount of water that goes into the heater is adjustable and the water pressure switch is also adjustable. The owners manual explains how to adjust both but neither should need adjustment unless you have a special configuration (explained in the manual).

Posted on Sep 20, 2010

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