How to Diagnose and Repair a Dead Titan Hammer Drill (Trigger Switch Replacement)

Recently, a friend was about to throw away his broken Titan hammer drill and head to Screwfix to buy a brand new one for £80 to £90. His argument was, “It’s cheap enough, I’ll just buy a new one.” I convinced him to let me look at it first.

Often, the faults on corded tools like this are incredibly simple and inexpensive to fix. Spending 10 minutes to diagnose the fault can save you a fair bit of money and, more importantly, stop perfectly good electrical equipment from ending up in a landfill. The right to repair is vital, and we should push back against the built-in obsolescence that encourages us to throw away appliances every few years.

In this repair guide, I will walk you through how to systematically diagnose a corded drill that is completely dead and show you how to replace the trigger switch which is an £18 part that completely resurrected this tool.

Common Reasons Your Corded Drill Won’t Turn On

When a corded tool is dead as a doornail, the issue almost always lies in the power delivery or the switching mechanism. Here are the most common culprits:

• Blown plug fuse: Always the first thing to check on UK 3-pin plugs.
• Cable failure (Metal fatigue): Wires often break internally near the plug or where the cable enters the base of the drill due to constant pulling, wrapping, and bending.
• Worn carbon brushes: If the motor brushes wear down to the wire, the motor cannot receive power.
• Faulty trigger switch: Internal contacts can arc and carbonize, failing over time.

Step-by-Step Titan Hammer Drill Diagnostic Guide

Before ordering any spare parts, we need to locate the exact point of failure. Ensure your drill is completely unplugged from the mains before opening the casing.

1. Open the Titan Hammer Drill’s Casing

• Remove all the screws securing the outer casing. These are usually Phillips or Torx screws (this Titan drill used standard screws and one Torx 30).
• Keep a close eye on the screw lengths. If they vary, take a quick photo or note exactly where the longer or shorter screws belong.
• Carefully prize the two halves of the handle and casing apart. You may need a flat-blade screwdriver to gently separate them.
• Peel back any rubber dust guards near the chuck.

2. Inspect the Motor and Carbon Brushes

• Once inside, look at the motor armature (the spinning copper commutator) and the carbon brushes at the rear of the motor.
• The armature should be shiny without heavy score marks or burning.
• The carbon brushes should have plenty of length left. If they are worn down to the braided wire, they need replacing. In our case, the motor and brushes were in excellent condition.

3. Test the Power Cable Continuity

Next, verify that power can actually reach the switch. You will need a multimeter set to the continuity function for this. (Here is the amazon affiliate link for the multimeter.)

• Disconnect the live (brown) and neutral (blue) wires where they plug into the trigger switch.
• Place one multimeter probe on the plug’s live pin, and the other on the live wire end inside the drill.
• Do the same for the neutral side.
• Engineer’s Tip: While testing, gently bend and wiggle the cable near the plug and the drill base. If the continuity beeps intermittently, you have a broken wire inside the flex and need to replace the main cable. If the connection remains solid, your cable is fine.

4. Test the Trigger Switch

If the cable is good, the switch is the prime suspect. These switches fail because the internal contacts carbonize. As you pull the trigger, the contacts create a microscopic spark. Over time, poor-quality contacts build up carbon and stop conducting electricity entirely.

• Place your multimeter probes across the neutral input and output terminals on the switch. Pull the trigger. You should get a continuity beep.
• Repeat this for the live input and output terminals.
• If you do not get continuity across one or both sides when the trigger is pressed, the switch has failed.

Paul’s note for experienced repairers: You can temporarily bypass the switch using a heavy-duty connector block to join the live wires together and the neutral wires together. Plugging the drill in and switching it on at the wall will immediately confirm if the motor runs. Only do this if you are highly competent with live electrics, as the internals will be exposed.

How to Replace the Titan Hammer Drill’s Trigger Switch

Once you have confirmed the switch has failed, order a replacement. For this specific Titan drill, a new switch costs around £18, making the repair highly economical.

1. Remove the Old Switch: Disconnect the two live wires and the two neutral wires from the faulty switch. Pay attention to their positions (usually neutral on one side, live on the other).
2. Wire the New Switch: Insert the wires into the new switch. Ensure the bare copper is fully inserted and the screw terminals are tightened down firmly with a good-quality screwdriver. A loose connection will cause arcing and premature failure.
3. Seat the Components: Place the new switch back into its housing inside the drill handle. Make sure the electrical filter (suppressor) is also dropped neatly into its designated slot.
4. Route the Cables: Carefully route all internal wiring through the plastic retention channels. If a wire is out of place, it will get pinched and short out when you screw the casing back together.
5. Reassemble the Casing: Drop the rubber dust guard back into its groove. Put the top half of the casing back on, ensuring it sits flush, and secure it by hand-tightening the screws.

After reassembly, testing the drill with an inline ammeter showed it drawing a healthy 600W of power. This older Titan drill is a solid piece of kit arguably built better than some of the newer budget models hitting the shelves today.

Throwing away an £80 drill for the sake of an £18 switch and 10 minutes of diagnostic testing is exactly what keeps the cycle of needless consumerism going. By learning to diagnose these basic faults, you save money, learn a new skill, and keep perfectly repairable appliances working for years to come.

If you have any questions about your appliance, please provide your brand, full model number which is written on the identification label, and a detailed description of the issue. Please visit our Contact Us page and make sure you fill out the request for what your problem is. A video shoot of the problem would be perfect as well.

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