That the hot tub tech won't tell you
1. Balboa M7 Circuit Board: The reading across the two pins where both the "A" & "B" sensor plug-in should read .5 volts DC.
2. Gecko Circuit Board: If you have three flashing dots on the display and there is a red light illuminated on the circuit board then the high limit sensor needs to be replaced. If the red light is not on, then there is a flow issue or faulty pressure switch. See "error codes/blinking dots" above.
3. With the power off and everything hooked up properly, you should get approximately 20 ohms when measuring across line one (L1) and the neutral line with a 120 volt transformer, and approximately 40 ohms with a 220 volt transformer. If you do not get these readings, then either a fuse is blown or the transformer is faulty. Readings should be taken at the terminal block on the circuit board.
NOTE: A reading from L1 to neutral does not indicate a short. The readings above are normal so please do not send your circuit board in for repair with the above readings.
4. If you or the hot tub technician installs a new circuit board and days or weeks later it melts and/or burns at the heater connection, this is due to a loose connection and not a defective board. The manufacturer will not warrant this type of damage. Make sure you sufficiently tighten the heater nut/screw - Torque Specs = 30-35 Inch - lbs.
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