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Need an owners manual or a relay wiring diagram for a Mr. Spa hot tub 303 or 404. serial number 6229 Its an older hot tub with 2 relays that control 4 electrical plugs for the blower,pump blower and pump.

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Should be able to pick up one online

Posted on Oct 03, 2009

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If you are positive that the two hot lines onto the motor relay are in the correct postition, then it is the control wires not giving power to the relay to close the circuit. Make sure the signal wires are connected to the contrl board. then, check to see if the timer is still working. its always possible that the control board has failed under the surge conditions. If signal wiring is in place and relay still wont close the circuit, disconnect the relay signal wires, set the timer to come on, and after it tries to activate that relay, measure for 24 volts at the relay signal wire terminals. If no voltage is found, bad timer, or bad board.
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I have a Ramco spa pack and the heater works at first but once it reaches temp and turns off. When the heater tries to kick back on the contactor will chatter and not close all the way unless i push it...

The chattering is exactly what happens when a relay fails. If this is an older model tub, it is likely that you can just replace the ice cube relay. If it is a newer tub, the relay is most likely imprinted into the main cpu board, in which case you have to have somebody put a new relay on the board for you, or replace the control board. If this is an older tub and you need help sourcing parts, you can contact me @

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it sounds like the pump relay may be stuck closed. Also check the temp readout, if it thinks the water is too hot it will try to cool the water by running the jets and sometimes the blower as well.

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That serial code is for the controls, not the hot tub.

Usually manufacturers will attach a plaque with the hot tub details on.... this would usually be at the front of the hot tub, either on the inside of a cabinet panel, or on the exterior.


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