Work only on electric dryers that use a resistance heating element. Gas models heat with an igniter and gas valve and require different procedures. Unplug the cord from a 120/240 V receptacle. Do not open the service panel, reroute branch circuits, or modify hard duct inside walls; those tasks belong to licensed trades under Canadian code. If the dryer shows scorch marks, persistent odour, or tripped breakers, stop and book service.
How Electric Dryers Produce Heat
A coiled nichrome element converts electrical energy into heat while the blower moves air through the drum and out the vent. High-limit thermostats and thermal cut-offs open the circuit if temperature rises beyond design limits. When airflow is restricted, the element runs hotter, coils sag, and safety devices open. Replacing a burned element without fixing airflow leads to a fast repeat.
Normal Vs. Not: Electrical And Visual Thresholds
Start with the model’s rating plate. Note supply voltage and heater wattage. Use the simple relationship R=V2/PR = V^2 / P.
For a common 240 V, 5.0–5.6 kW heater, expected cold resistance is roughly 10–12 Ω. For compact 120 V units rated 1.3–1.6 kW, expect about 9–11 Ω. Readings within ±15% are generally acceptable; “OL” or infinite resistance indicates an open coil. A near-zero reading suggests a short to the housing and requires immediate replacement.
Visually inspect the element cage. Normal coils sit centred with even spacing and no contact points. Not normal: bright hotspots, collapsed turns, or any place the coil has touched the metal frame. A coil that sags close enough to rub the cage (clearance approaching a couple of millimetres) is unsafe and will arc under load. On thermostats and cut-offs, room-temperature continuity is normal; an open device at room temperature signals it has tripped or failed and must be replaced as a set per the service manual.
Quick Checks Before You Open Panels
Confirm strong airflow at the exterior cap. If the flap barely opens or ice builds up in winter, expect lint accumulation or a crushed hose. Clean the full vent path first. Remove the lint screen and vacuum the cavity. If the drum turns and the dryer runs cool with good airflow, focus on the heater circuit. If airflow is weak, restore it before any electrical testing.
Step-By-Step Diagnosis
Unplug the dryer and pull it forward for access and light. Remove the rear service panel or lower front panel, depending on design. Photograph wiring routes so reassembly is exact.
Isolate the heater terminals. Disconnect both wires from the element so your meter reads only the coil. Set a digital multimeter to the lowest resistance range. Touch probes together to note your lead resistance, then measure across the coil. Compare the value to your V2/PV^2/P calculation. If the meter shows “OL,” the coil is open. If resistance is far below expected, inspect for a coil touching the frame.
Test the surrounding safety devices. With at least one lead removed from each device, check continuity through the thermal fuse and high-limit thermostat. At room temperature they should read near 0 Ω. An open fuse means the dryer overheated; do not simply replace the fuse. Find and correct the airflow or cycling-thermostat cause before installing new parts.
If all components test good yet the dryer still does not heat, evaluate the timer or control board output to the heater relay and confirm both supply legs are present at the terminal block. Panel and receptacle work is out of DIY scope; call a licensed electrician if supply is suspect.
Replacing The Heating Element
Order the element by full model number to avoid mismatched cages or terminals. Many brands offer a complete heater housing; others supply only the coil assembly. Using OEM parts keeps resistance and fit within spec.
Remove the element housing screws and slide the assembly out. Note insulating cards or standoffs and transfer them if the new part does not include them. If you are replacing a coil only, unwind the damaged coil carefully and install the new one with even spacing. Avoid tight bends that create hotspots.
Reinstall the assembly, route wires exactly as photographed, and secure connectors fully. Loose spades rattle and overheat. Before closing panels, vacuum lint from the blower inlet and heater tunnel. Reassemble the cabinet and confirm no harness is pinched.
Proving The Fix And Preventing Repeat Failures
Restore power and run the dryer empty on a heat cycle for two to three minutes. You should feel steady warm airflow at the exterior cap, followed by cycling off and on as thermostats regulate temperature. Add a damp towel and confirm stable heat under load.
Prevent recurrence by reducing backpressure. Keep the vent run short and smooth, use rigid metal duct, and avoid crushed flex hose behind the machine. In cold climates, ensure the exterior cap opens freely and does not freeze shut. Clean the lint screen every load and the vent path at least annually, more often for long runs.
When To Stop DIY And Call A Professional
Stop if the coil shows signs of arcing to the frame, if breakers trip on restart, if wiring or the terminal block is heat-discoloured, or if your meter finds supply issues on one leg of a 240 V circuit. Any work inside the service panel, new receptacles, or concealed duct changes must follow Canadian electrical and building requirements and be handled by licensed trades.
FAQ
How Do I Calculate The Correct Resistance For My Element?
Read the voltage and heater wattage on the rating plate, then apply R=V2/PR = V^2 / P. Example: 240 V and 5400 W yields about 10.7 Ω. Readings within ±15% are typical for cold coils.
My Thermal Fuse Tested Open. Should I Just Replace It?
No. An open fuse points to overheating, usually from restricted airflow or a stuck cycling thermostat. Fix the cause, then replace the fuse and any paired cut-offs as a kit.
The Element Shows Continuity But The Dryer Still Won’t Heat. What Next?
Check that both supply legs are present at the terminal block and that the heater relay or timer is delivering power. If supply or control is suspect, book a licensed technician or electrician.
Can I Lubricate The Heater Housing To Stop Squeaks?
Do not apply lubricants near the heater. Oil attracts lint and becomes a fire risk. Address the true source, typically rollers or the idler, independent of the heating circuit.
Are Small Coil Sags Acceptable?
No. Coils must not touch the cage. If spacing has collapsed to a few millimetres or there are rub marks, replace the element; the coil will arc under load.
Sources
- CSA Group — Canadian Electrical Code, Part I (CSA C22.1). Defines electrical safety boundaries and qualified work for residential appliances in Canada.
- Electrical Safety Authority — Ontario Electrical Safety Code. Provincial interpretation and enforcement guidance for electrical work in Ontario.
- Government of Canada — Canada.ca Content Style Guide. Reference for Canadian English spelling and web terminology.
- Public Services and Procurement Canada — TERMIUM Plus Terminology Data Bank. Reference for consistent Canadian terms.
- Manufacturer Service Manual — Specific To Your Model. Wiring routes, resistance values, fault isolation, and component part numbers.
