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Test for continuity between
the two legs of the 20 amp
yellow ATO style fuse
Shut off power to the control box.
Disconnect the blue, white, gray and
violet wires from the main board and measure
the following:
Insert probes and measure resistance between the Blue & White
wires and the Violet & Gray wires. The readings should be 2.0-
2.9 Ohms.
If the readings of either of the two measurements are not
2.0
– 2.9 Ohms, the transformer is faulty and should be replaced
(GLX-XFMR). If measurements are OK, reconnect wires and go
to step 4F.
Replace fuse if blown. If fuse OK, go
to step 4G.
Step 4E
Step 4F
4. Display Only, Lights Only or Neither