Digital Multi-Tester Instructions

If you do not have a multi-tester you can order this compact model from us for £11.17 including VAT and delivery. Order Online.

This is a quick guide to the main functions you will need to use to check the electrical components of your shower.

The only check that needs to be carried out “LIVE” is to check that you have power going to your shower “All” other checks can be carried out with the power switched off.

Power Supply

To check that you have power going to your shower, set the meter to measure voltage like this:

Now enter the two probes into the terminal block (Red probe to the red/brown wire) and (Black probe to the black/brown wire). You should have a reading of  230v - 250v.

If you have no voltage here, check the fuse and the pull cord switch. If you do have a voltage reading here, turn the power off because all other checks can be carried out with the power switched off.

Continuity Test

Set the meter like this:

If you place one probe at the end of a wire, switch or any other component and the other probe at the other end of the wire etc. you will hear a bleeping noise if you have continuity. No noise means there is a break in the cable or the switch is open

(As a test, touch the two probes together and you should hear the bleeping sound).

Heating Tank

Set the multi tester like this:

Now depending on your shower, it will have either 4 or 6 rods coming out of the top of the heating tank these rods are the ends of the heating elements and they are in pairs. Use the continuity tester to work out which two pair up with each other.

The red/brown wire rods pair with the black/blue wired rods. Some of the black/blue wires may be joined together.

Once you have found the correct pairs, set the multi tester like this:

Now check for resistance, you should have a reading of between 10-20ohms.
If the element is faulty then it will normally be open circuit and have a reading as displayed in the image to the left.

Thermal Cut Out

To check the TCO set the tester like this for continuity:

Placing a probe at both terminals of the TCO you should hear a bleeping sound if the TCO is good. If the TCO is faulty there will be no sound, ie. there is a break in the circuit (as a test, touch the two probes together and you should hear the bleeping sound).

Solenoid Valve

To check a solenoid you need to set the multi tester like this:

For resistance you need to press the probes on to the two terminals of the solenoid (the polarity is not important) and if you have a good solenoid then the reading will be 3.4K Ohms or above (you should check the solenoid when it is in the failed state).

DC Transformers  

To check transformers, you need to set the multi tester like this:

In the red V section set dial to expected voltage, press probes on to the terminals and read off the actual voltage.

Finally, if you do not feel competent enough to use this tester, please call in a professional as working with electricity can be dangerous.

Tel: 0131 538 4343 - Fax: 0131 477 2623 - info@showerdoc.co.uk