Question about Malibu ML600TW - Low Voltage Power Pack - 600 Watt - With Timer and Ground

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Malibu landscape transformer

The timer won't work. I can manually turn on/off lights. Are there simple checks I need to do before replacing the tranformer?


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  • epankey Dec 13, 2008

    The unit does not keep time. I can only turn it on and off manually. Brand new - it never worked. I am taking it back to the store. Originally, I thought I simply could not locate the timer on/off switch.

  • Anonymous Mar 08, 2009

    I have two different Malibu timers that will not switch the lights on. If I remove the pegs, the timer works fine. However, whent he on/off pegs are installed, the timer stops at teh peg and will notturn the unit on.

  • chazdisc2 May 03, 2009

    I have a ML88T that has this problem. I've removed the timer face and found that the gear linking the motor gear to the timer gear is worn enough as to no longer engage with the motor gear.

    Too bad I have not found this gear to be available. As long as the motor is not burned out, this little gear would solve the problem.

  • Anonymous Mar 14, 2014

    While wiggling my light bulb to see if it would come on, all the lights in the malibu system went out. Power appears to be going to tranformer



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If it is keeping time try moving the stops. If it is not keeping time the motor is probably burned out. These transformers don't have a lot of serviceable parts to them.

Posted on Dec 04, 2008


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Intermatic TN111 24-Hr. timer clock not turning

Make sure lamp is turned ON, and that light bulb is good.
Rotate manual override button on timer to check that light turns on-off.
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If you are having problems with multiple failed timers, then use circuit analyzer to test outlet polarity and grounding. If that checks out, have electrician check how clean the electrical lines are.
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You posted under Intermatic raintight timer.
Add a comment with your model and brand and I have extensive files on timers.

The best diagnostic is the manual override.
1) Click manual override and see if Load (lights, fan, motor) come on.
If manual override clicks on-and-off crisp and clean, but the lights do not come on, check your electric power.
If the manual override does not click crisp and clean, then the timer may be rusty, or timer may need to be replaced. Buy replacement timer and swap out timer mechanisms without changing the box.
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2) Check if the dial is turning as time passes.
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If dial is turning, and manual override turns Load on-and-off, then the tripper pins might be worn out, and you can buy new trippers.

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Grainger sells trippers and motors:
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I have the 600-water Malibu transformer. Some nights one of the loops of lights will go out. The other loop stays lit. I might go out 30 minutes later and both loops are lit. I am still well under the...

Check for a loose connection where the problem "loop" connects at the tranformer.
Also, swap the "loop" connections to the tranformer. If the problem still persists replace the wire run. Sometimes wire gets damaged internally and visual inspection will not reveal that.
If the problem occurs in the other loop after the swap, then you probably have a bad connection inside the transformer. If that is the case, you won't be able to use that connection as the transformer has no user servicable parts.
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