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Quick answer
The supplied report identifies an AEG Protex Plus LT75780IH3 whose display and complete power can disappear sporadically, including before the drum or heater starts. AEG's own dryer guidance starts with the outlet and breaker, a single unplugged reset, door closure, indicators, water tank and drain checks; it says to stop using the appliance and arrange authorised service if those checks do not resolve the problem. Do not keep restarting a dryer that loses power or open its cabinet to test a thermal, motor, wiring or control component.
Work through in order
Diagnostic checks
Use only checks that match the exact appliance or system and its official guide.
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Check 1
With the dryer switched off, check the wall outlet with a separate low-load appliance, confirm the plug is fully seated, and look at the breaker or RCD without repeatedly resetting it. If the dryer has just lost power, leave it disconnected while you record whether the outlet itself remains live.
Expected result: The outlet or RCD is also abnormal, or the outlet works normally while the AEG display remains completely dark.
Next step: If the outlet or RCD is abnormal, leave the dryer disconnected and resolve the supply safely. If the outlet is normal and the dryer is fully dead, do not remove panels or test live parts; proceed only with the single controlled reset below and service if it recurs.
Why this matters
Why: A dead outlet or changed RCD points to the household supply and needs an electrician or qualified person. A working outlet with a dryer that loses all power localises the symptom to the appliance, but does not identify a board, thermal device, motor or wiring fault.
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Check 2
After the dryer is cool and disconnected, perform one controlled reset: leave it unplugged for the five minutes AEG specifies, reconnect it, and select the same programme once. Record whether the display returns, whether the drum actually starts, and whether the failure is immediate or follows a period of operation.
Expected result: The dryer returns and completes a cycle, returns but loses power again, or never returns at all.
Next step: If the shutdown repeats or the dryer remains dead, unplug it and arrange authorised AEG service with the model, PNC/serial information, exact timing, and any displayed code. Do not keep cycling power to reproduce the fault.
Why this matters
Why: A temporary return does not prove that the fault is fixed. A repeat loss of all power, especially before the drum or heater starts, is not enough evidence to name a thermal protector or control board from symptoms alone.
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Check 3
If the display stays on and the dryer stops as a programme event rather than losing all power, inspect only the user-accessible conditions: close the door fully, check for a child-lock or delay/energy-saving indication, empty the water tank if its indicator is lit, and verify that any external drain hose is not kinked. Follow the LT75780IH3 manual for the exact control combination and drain arrangement.
Expected result: A door, lock, delay, tank or drain indication is present, or none of these indicators is present and the display goes completely dark.
Next step: Correct only the visible condition described by the model manual and make one test. If there is no such indication, or if complete power loss returns, stop using the dryer and use authorised service rather than replacing a guessed part.
Why this matters
Why: AEG says a door that is not fully closed can prevent starting, a lock or energy-saving mode can limit controls, and a full tank or drain problem can stop the cycle. Those conditions explain a controlled programme stop; they do not explain an appliance that loses every display and control function.
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Check 4
With the appliance disconnected and cool, clean the lint filter as AEG directs and inspect the condenser or airflow area only where the LT75780IH3 manual permits access. Do not touch condenser metal with bare hands, force a cover, or dismantle the cabinet; note any blocked-filter or condenser indicator.
Expected result: The filter or condenser area is visibly restricted, an indicator remains on, or the user-accessible paths are clean while the dryer still loses power.
Next step: Refit every user-accessible part correctly and make no more than one supervised test. If the dryer again loses all power, leave it unplugged and book authorised service; do not open the cabinet or bypass a safety device.
Why this matters
Why: AEG links maintenance of filters, condenser and airflow slots with performance and says a blocked condenser can damage the dryer. Cleaning can remove a maintenance-related cause of poor operation, but it cannot confirm an internal overload, sensor, heater, motor or control fault.
Use your observations
Decision map
Find the observation that best matches what you see, then follow the next safe action.
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PATH 01Next step
What you see
The wall outlet is dead, the breaker/RCD will not remain on, or another appliance also loses power.
Do this next
Keep the dryer disconnected and have the supply checked by a qualified electrician; do not repeatedly reset the protection device.
Why this path and its safety boundary
Why it matters: The first fault is in the household supply or protection device rather than a proven AEG dryer component.
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PATH 02Next step
What you see
The outlet works, but the LT75780IH3 display and controls go completely dark and the dryer cannot be restarted immediately, including when the drum had not yet run.
Do this next
Unplug the dryer, stop repeated tests, and give authorised service the model/PNC, the timing of the shutdown, and any code or indicator observed. Do not dismantle or make live electrical measurements.
Why this path and its safety boundary
Why it matters: This matches the reported complete-power-loss pattern and is not explained by a normal dryness decision or by a single filter-cleaning result. The symptom does not identify which internal part has failed.
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PATH 03Next step
What you see
The display remains on and a tank, drain, door, lock, delay or energy-saving indication accompanies the stop.
Do this next
Use the LT75780IH3 manual to correct the indicated condition, empty the tank or check the visible drain path as applicable, then make one test. Escalate if the indication remains or power is lost.
Why this path and its safety boundary
Why it matters: AEG documents these as user-level conditions that can prevent starting or stop a drying programme, depending on the dryer configuration.
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PATH 04Next step
What you see
The dryer repeatedly shuts down after a reset or after a short run even though the outlet, door, indicators and user-accessible maintenance points are normal.
Do this next
Leave the dryer unplugged and arrange authorised service. Provide the exact model and PNC/serial data and describe whether the failure occurs cold, at startup, mid-cycle or near the end.
Why this path and its safety boundary
Why it matters: An intermittent internal electrical, motor, control or protective fault remains possible, but no opened AEG source here supports naming one component from this symptom.
Helpful context
Understand the symptom
First separate a normal cycle stop from a complete power loss
A dryer can stop a programme because a water-tank or drain condition is detected, but the Reddit report describes a different and more serious symptom: the display goes dark and the appliance loses all power, sometimes before the drum or heater has started. Note whether any indicator remains lit, whether the breaker or RCD changes state, and how long the controls remain unavailable. Do not call a cycle ending normally a control-board failure without this distinction.
Use the AEG manual for model-specific access
LT75780IH3 is the assigned identity, but AEG states that access to a condenser and the exact maintenance procedure can vary by dryer model. Use the model's rating-plate details and its user manual before opening any cover. The checks below are limited to the user-accessible supply, controls, door, tank, filters and condenser area described by AEG; they do not diagnose an internal component.
When checks do not resolve it
Need a professional?
Arrange authorised service when complete power loss recurs after the outlet is confirmed good, when the dryer remains dead after one controlled reset, when a breaker/RCD trips again, or when a door, drain, tank or maintenance check does not resolve the symptom.
Common questions
FAQ
Could this simply be the AEG dryer finishing the cycle?
A programme can stop for a documented condition such as a full water tank, but a display that goes dark and a dryer that loses all power is a different symptom. Confirm whether any indicator remains lit before treating it as a normal cycle end.
Should I keep unplugging and reconnecting the dryer until it stays on?
No. AEG gives a single five-minute unplugged reset as a check. If complete power loss returns, leave the dryer unplugged and arrange authorised service instead of repeatedly reproducing the shutdown.
Can I replace a thermal fuse, motor or control board from this symptom?
Not safely from this symptom alone. The opened AEG guidance supports external checks and service escalation, while the exact report does not identify an internal component. Use the model and PNC for service diagnosis rather than ordering a guessed part.
What should I record before contacting AEG?
Record the model, PNC, serial number, whether the display went dark, whether the drum or heater started, when the shutdown happened, how long the controls stayed unavailable, and any code or indicator. AEG says these details help its technical team assess the problem.
Read the exact guide
Official sources
- Cleaning tumble dryer filters and condenserAEG Support · Opened AEG guidance applicable across heat-pump, condenser and vented dryers. It requires regular filter cleaning, warns against operating with a blocked condenser, says metal condenser surfaces need protection, and directs the user to the exact manual because access differs by model.
- Tumble dryer does not start / does not workAEG Support · Opened AEG UK support guidance for tumble dryers. For the assigned AEG LT75780IH3 page, it covers a five-minute unplugged reset, outlet and breaker checks, fully closing the door, child-lock and energy-saving indications, a full water tank, external-drain kinks, and authorised service if the issue remains. Exact controls and drainage vary by model; this page is general AEG guidance, not a model-specific diagnosis.
- What to check before contacting AEG consumer serviceAEG Support · Opened AEG service-preparation guidance. It supports checking the supply, a three-to-five-minute disconnect, filters and airflow, recording exact codes and model/PNC/serial details, using the model manual, disconnecting before cleaning, and not dismantling internal components unless AEG instructs it.
- Dryer turning off right after display turned on (but not always)Reddit, r/appliancerepair · Opened the exact supplied Reddit post. It identifies the appliance as AEG Protex Plus LT75780IH3 and reports shutdowns mid-cycle, near the end, or within seconds after only the display comes on; a follow-up says the display and complete power are lost and the dryer may not restart immediately even when cold. Community replies are not used as technical diagnosis.
- How to clean and maintain your AEG tumble dryerAEG Support · Opened AEG maintenance guidance. It says to clean the lint filter after each use, empty the water tank, maintain the condenser and airflow slots, and clean the humidity sensor; it states that a full tank can stop the dryer and that condenser access varies by model.
- Tumble dryer has no powerAEG Support · Opened AEG UK support guidance for a dryer that does not react or light up. It supports checking the outlet and breaker, fully closing the door, a short unplugged reset, cooling after prior overheating, and filter/condenser maintenance, followed by authorised service if the appliance remains inoperative.
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