The short answer
On a condenser dryer, check whether the tank is filling before deciding the heater has failed. A warm drum with a dry tank means condensation has stopped, not heating.
What you actually see and hear
- The drum is warm but the load stays damp — Condensation has failed. Check whether the tank fills.
- The drum never gets warm at all — A genuine heating fault or a tripped cut-out.
- The water tank stays empty after a full cycle — Confirmation that nothing is condensing.
- The room gets hot and humid during a cycle — Air escaping the circuit, or a badly seated exchanger.
- It heats then stops part-way — A thermal cut-out operating on restricted airflow.
Causes, most likely first on this machine
- Heat exchanger furred with lint — First. The classic condenser fault: heat is fine, condensation is not, and the tank stays dry.
- Lint filters blocked — Second. Restricted airflow costs both heat and condensation.
- Room too warm or the machine too enclosed — Third. The cooling side needs air cooler than the drum air.
- Exchanger not seated or its flap not closed — Fourth. Air bypasses the cooling circuit entirely.
- Thermal cut-out tripped by restricted airflow — Fifth, and a consequence rather than a cause.
- Heating element or thermostat — Last, and only when the drum genuinely never warms.
Check in this order, and why
- Feel whether the drum is warm at all — It splits this into two different faults.
- Check whether the water tank fills during a cycle — A dry tank with a warm drum is the condenser fault.
- Pull out the heat exchanger and inspect it — The leading cause on this design.
- Check both filters and the exchanger flap — All three affect the same airflow.
What an owner can safely check
- Wash both lint filters in warm water and dry them fully — Restricted airflow costs heat and condensation together.
Tools: warm waterAbout 15 min
- Remove and rinse the heat exchanger, then refit it until it clicks home — The fix for most damp-load complaints here.
Tools: warm water, clothAbout 30 min
- Check the exchanger flap closes fully — If it does not, air bypasses the cooling circuit.
About 10 min
- Empty the water tank and note whether it refills next cycle — The clearest single measurement on this machine.
About 60 min
- Open the room or cupboard door and run a cycle — Cooler air on the condenser side makes a real difference.
About 60 min
- STOP HERE before testing the element, thermostats or thermal cut-out — Live work on a hot machine.
Before you open anything
Safety
Unplug the appliance or switch off its breaker before removing any panel - a capacitor can hold a charge after the power is off. A condenser dryer collects hot water in a tank and in its heat exchanger, so let the machine cool before emptying or rinsing either. Lint is still fuel even without a vent: never run the machine with the filters out, and never bypass a thermal cut-out to make a cycle finish.
When to call a technician
Call when the drum genuinely never warms after the filters and exchanger are clean, because that points at the element, a thermostat or a thermal cut-out. Call when the tank stays dry despite a clean exchanger and a cool room. Mention whether the drum gets warm, since a warm drum with a damp load and a dry tank sends an engineer to a completely different part of the machine.
Nearest pages of this class
What this page does not cover
This page is written for the condenser dryer class, not for one family or model line. Where a brand- or model-specific page exists for your unit it is the more specific answer and it is linked above, so go there first if your machine is named. What is deliberately not here: condenser and heat-exchanger part numbers, thermostat ratings, drum roller references and tank capacities, all of which differ by family and belong on the page for that family.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
