Introduction

The guide shows how to replace the relay (transformer) in a timer switch. This transformer is used for heater control. Without this transformer, the switch does not work.

The timer switch was bought at Gamma (link), a large construction store.

  1. Locate the screw holes.
    • Locate the screw holes.

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  2. Use the #1 Phillips head screwdriver to remove the screws. This may cost some prying effort.
    • Use the #1 Phillips head screwdriver to remove the screws. This may cost some prying effort.

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    • Open the case by pulling the back case from the front case.

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    • Use the #1 Phillips head screwdriver to remove the screws on the inside.

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    • Pull the PCB (printed circuit board) from the case.

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    • Locate the relay.

    • Locate where the relay is connected to the PCB.

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    • Melt the solder with the soldering iron.

    • Don't burn yourself by touching the hot soldering iron tip.

    • Use the desoldering pump to suck up the old solder.

    • Pull the relay from the PCB.

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    • Put a new relay at the same place as the old relay.

    • Use new solder and the soldering iron to connect the new relay to the PCB.

    • Don't burn yourself by touching the hot soldering iron tip.

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Conclusion

To reassemble your device, follow these instructions in reverse order.

One other person completed this guide.

One Comment

Very nice instruction, also for maintaining gardening equipment as a robotic lawnmower.

theodevries - Reply

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