Troubleshooting
14
Transformer Voltage Checks
The transformers used in United Spas controls have 4 wires. There is a
black and a brown wire (These two wires are blue and a white on the 120V
transformers), and two yellow wires. It should be possible to slide the pins
of your voltmeter/multi-meter into the top of the transformer plug (Which
is plugged into Testing Point 8) where the wires enter the plug. 240VAC
(Range of acceptability: 216VAC to 264VAC) should be read between
the black and brown wires on a 240V transformer or 120VAC (Range of
acceptability: 108VAC to 132VAC) between the blue and white wires on a
120V Transformer. If you are not getting a reading of the incoming power
within the acceptable range, and you’ve confi rmed the incoming voltage
with the previous voltage checks, then the 2A Glass Fuse (Testing Point 7)
should be checked next.
If the incoming voltage checks out, proceed to test the output voltage.
12VAC (Range of acceptability: 12VAC to 14VAC) should be read between
yellow wires. If the voltage read between the yellow wires does not fall
within the indicated ranges of acceptability, then do not proceed with any
further troubleshooting until the transformer has been replaced. If the
incoming voltage read does not fall within the range of acceptability, re-
check the incoming voltage to the control box.
Checking the 2A Glass Fuse
Put one probe of your voltmeter/multi-meter on Line-2 (Testing Point 2),
and the other on the RIGHT fuse clip of the 2A Glass Fuse (Testing Point
7). You should get a voltage reading equal to the control box’s incoming
power voltage (240VAC or 120VAC). Leaving one probe on Line-2, move
the other probe to the LEFT fuse clip. You should again get a voltage
reading equal to the incoming power voltage, if you do not, then the fuse
has blown and needs replacing.
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