I don't have repair for defective product.
Two cfl lights will not exceed load rating of photo-eye
1) Put black tape over photo eye and see if lights turn off. Do not
expose photo eye to direct sunlight. Turn photo eye away from possible
source of light at night.
2) Wiring is suspect.
Open following link:
http://waterheatertimer.org/How-to-wire-Cooper-277-pilot-light-switch.html#photo-eye3) Reversed polarity is next suspect.
Cable from breaker box has black, white and ground wires.
Separate wires, turn power ON, stand on dry boards and never on dirt or ground, do not lean or touch anything: test each wire to bare ground wire. Tester lights up on Hot wire. Tester should light up one-and-only one wire as Hot. Hot wire connects to photo-eye black wire.
Next, test Hot wire to other wire and tester will light up on neutral. Photo-eye white wire connects to Neutral.
4) Short to ground. Disconnect ground wire and see if there is a short running back to busbar that is completing circuit.
5) K4100 series is rated for ballast. Replace CFLs with regular light bulb and see if there is difference.
This should not be the factor, so add a comment if you discover this photo eye cannot handle CFLs.
6) Contact Intermatic.
http://www.intermatic.com/customer%20service.aspx
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