Identifying a Heat Strip Failure on the Dimplex DT6600 Panel Heater

Understanding the Role of the Heat Strip

The Dimplex DT6600 panel heater delivers warmth by passing electricity through a resistive heat strip. When current flows, the strip becomes hot and transfers heat to the surrounding air through a built‑in fan. Because the heat strip is the core heating element, any fault will directly affect the unit’s ability to warm a room. Recognising the early signs of a failing heat strip can save time, money, and the inconvenience of a cold living space.

Typical Symptoms of a Heat Strip Failure

• No heat despite the fan running – The unit may still cycle the fan, but the air feels unchanged.
• Uneven or weak heat output – One side of the panel feels warm while the other stays cool.
• Intermittent heating – The heater turns on for a few minutes, then shuts off unexpectedly.
• Burnt or metallic odor – A faint smell of hot metal often indicates a damaged element.
• Error codes on the display – Some DT6600 models flash “E1” or “E2” when a heating fault is detected.

If you notice any of these clues, it is worth investigating the heat strip before assuming a more serious internal failure.

Safety First: Preparing for Inspection

Working with electrical components demands caution. Follow these steps before you open the heater:

1. Switch off the unit – Use the main power button on the heater and then turn off the circuit breaker that supplies the appliance.
2. Unplug the heater – Disconnect the power cord from the wall socket to eliminate any residual voltage.
3. Allow the heater to cool – The heat strip can remain very hot for several minutes after use. Wait at least 10 minutes.
4. Gather the right tools – You will need a flat‑head screwdriver, a Phillips screwdriver, a digital multimeter, and a clean cloth.
5. Wear protective gloves – A pair of insulated gloves reduces the risk of accidental shock.

Only proceed once you are confident the unit is completely de‑energised.

Required Tools and Materials

Having these items on hand will streamline the diagnostic process.

How the DT6600 is Constructed

Before diving into the inspection, it helps to visualise the layout of the heater:

• Front panel – Houses the control knob, digital display, and safety grill.
• Rear housing – Contains the fan motor, wiring harness, and mounting brackets.
• Heat strip assembly – Situated behind the front grille, attached to a metal plate that conducts heat.
• Thermostat and over‑heat sensor – Located near the heat strip, these protect the unit from excessive temperatures.

Understanding where each component lives makes it easier to locate the heat strip quickly.

Step‑by‑Step Guide to Identifying a Faulty Heat Strip

1. Removing the Front Grille

• Locate the four screws that secure the front grille to the rear housing. They are usually positioned at the top corners and near the bottom.
• Using the appropriate screwdriver, gently loosen each screw. Keep them in a small container.
• Carefully lift the grille away from the unit. If it feels stuck, check for hidden clips and release them gently.

2. Visual Inspection of the Heat Strip

With the grille removed, the heat strip should be visible behind a protective metal plate.

• Look for discoloration – Dark spots, blackening, or a blue‑tinted surface often indicate overheating.
• Check for physical damage – Cracks, broken coils, or broken connections are clear signs of failure.
• Inspect surrounding components – Ensure the fan blades are clean and the wiring harness shows no signs of fraying.

If anything unusual stands out, mark the area with a piece of masking tape for further testing.

3. Testing Continuity with a Multimeter

A functional heat strip will show low resistance and a continuous electrical path. Follow these steps:

• Set the multimeter to the “ohms” (Ω) setting.
• Touch the two probes together briefly; the meter should read near zero (often shown as “0.0” or a small number).
• Locate the two terminals at the ends of the heat strip. They may be connected with small clip leads.
• Place one probe on each terminal. Record the resistance reading.

Interpreting the result

• A reading between 0.5 Ω and 5 Ω (exact range varies by model) generally indicates a healthy strip.
• A reading of infinite resistance (OL) or “–” means the circuit is open – the strip is broken.
• A reading that is much higher than expected suggests internal corrosion or a partially burned coil.

If the continuity test fails, the heat strip is likely the culprit.

4. Checking the Wiring Connections

Even a good heat strip can appear faulty if the wiring is loose or corroded.

• Follow the wires from the strip back to the terminal block.
• Ensure each connector is fully seated and the metal pins are clean.
• Use the multimeter to verify that voltage reaches the strip when the heater is turned on (only do this if you are comfortable with live testing). This step confirms that the power supply is intact.

5. Assessing the Over‑Heat Sensor

The DT6600 includes a thermal cut‑out sensor that can shut down heating if it detects excessive temperature.

• Locate the sensor near the heat strip; it is usually a small metal probe with two wires.
• With the heater off, test the sensor’s resistance. Typical values range from 10 kΩ (cold) to 1 kΩ (hot).
• An open circuit or a steady low resistance regardless of temperature may indicate a failed sensor, which can mimic a heat strip problem.

6. Deciding Whether to Replace the Heat Strip

If the continuity test shows an open circuit, the visual inspection reveals damage, or the resistance is far outside the expected range, replacing the heat strip is the logical next step. Conversely, if the strip passes all electrical tests but the heater still does not produce heat, the fault may lie elsewhere (e.g., the thermostat, fan motor, or control board).

Replacing a Faulty Heat Strip

Gathering the Replacement

• Purchase a genuine Dimplex DT6600 heat strip or an exact equivalent part number. Using an OEM component ensures proper fit and safety certifications.

Removal Process

1. Disconnect the two power leads from the faulty strip. They are often secured with spring clips; gently depress the clip and pull the wire out.
2. Unscrew any mounting brackets holding the strip to the metal plate. Keep the screws for reuse.
3. Lift the faulty strip away from the housing.

Installation Steps

1. Position the new heat strip in the same orientation as the old one.
2. Re‑attach the mounting brackets and tighten the screws securely, but avoid over‑tightening which could warp the element.
3. Reconnect the power leads, ensuring each clip snaps firmly into place.
4. Double‑check that no wires are pinched and that the strip sits flat against the metal plate.

Final Visual Check

• Verify that the front grille can be re‑installed without obstruction.
• Ensure all screws are replaced and the housing is closed properly.

Testing the Heater After Replacement

1. Restore power – Turn the circuit breaker back on and plug the heater into the wall socket.
2. Set the thermostat – Select a comfortable temperature a few degrees above the current room temperature.
3. Observe the operation – The fan should start, followed by a gradual rise in outlet temperature. Feel the air a short distance from the grille; it should be warm within a few minutes.
4. Listen for unusual sounds – Any buzzing, clicking, or humming that differs from normal operation could indicate a loose connection.

If the heater now produces consistent heat, the issue is resolved. If problems persist, further diagnostics on the control board or thermostat may be required.

Preventative Maintenance Tips

• Clean the front grille regularly – Dust accumulation reduces airflow and forces the heat strip to work harder, accelerating wear.
• Check for loose wires during routine cleaning – A gentle tug on each connector can reveal hidden fatigue.
• Avoid using extension cords – They add resistance and can cause voltage drops that stress the heating element.
• Operate the heater within its rated voltage – Running on a lower or higher voltage than specified shortens the life of the heat strip.
• Schedule an annual inspection – Even if the heater appears to work fine, a yearly visual check can catch early signs of corrosion or wear.

When to Call a Professional

While many heat strip issues are straightforward to diagnose and replace, some situations warrant a qualified technician:

• The heater displays error codes that persist after strip replacement.
• The unit has suffered water damage or visible internal corrosion.
• You are uncomfortable performing live voltage tests.
• The fan motor or control board shows signs of failure.

Professional service ensures compliance with local electrical codes and maintains warranty coverage.

Frequently Asked Questions

What is the typical lifespan of a DT6600 heat strip?
Under normal usage and proper maintenance, the heating element can last between 8 and 12 years. Excessive dust, high humidity, or frequent cycling may shorten this period.

Can I use a generic heating element as a replacement?
It is best to use an OEM part that matches the exact specifications (voltage, wattage, physical dimensions). Generic elements may not fit correctly and could pose safety risks.

Why does the heater make a faint clicking noise during operation?
A soft click often comes from the thermostat’s relay engaging or disengaging. This is normal unless the sound is accompanied by an error code or intermittent heating.

Is it safe to run the heater with the grille removed for cleaning?
No. The grille protects the internal components from accidental contact and directs airflow. Operating the heater without it can cause overheating and damage.

What should I do if the heater still does not heat after replacing the strip?
Re‑examine the thermostat, fan motor, and control board for faults. Measuring voltage at the strip terminals while the heater is on can reveal whether power is reaching the element.

By following this comprehensive guide, homeowners can confidently identify a heat strip failure on the Dimplex DT6600 panel heater, perform a safe replacement, and restore reliable warmth to their living spaces. Regular upkeep and prompt attention to early warning signs will keep the unit operating efficiently for years to come.