The short answer
A Blomberg dryer is ventless: it condenses the moisture out of the air instead of blowing it outside, and that water has to go somewhere. "Will not drain" on this machine means the condensate tank, the sump or the optional drain hose — not a wash pump. A full tank stops the machine, so this is usually a maintenance job rather than a repair.
What you are seeing
- The tank-full indicator lights and the cycle stops early
- The condensate tank is empty even though the machine ran a full cycle
- Water in the tank looks normal but the indicator stays lit
- Water appears under the machine rather than in the tank
- The tank is overflowing when you slide it out
- A near-miss symptom: clothes still damp with no tank warning at all, which is a drying-performance problem
- Body: On a condensing dryer the water side has its own symptoms: The tank-full indicator lights and the cycle stops early. The condensate tank is empty even though the machine ran a full cycle. Water in the tank looks normal but the indicator stays lit. Water appears under the machine rather than in the tank. The tank is overflowing when you slide it out. A near-miss symptom: clothes still damp with no tank warning at all, which is a drying-performance problem.
Causes, most likely first
- The condensate tank is simply full — Why: a ventless dryer fills its tank in a load or two, and the machine stops rather than risking an overflow. This is by far the most common cause and it is not a fault.
- A blocked sump or condensate channel — Why: lint that gets past the filters settles in the channel that carries water to the tank, so the tank stays empty while the machine reports water it cannot move.
- The drain hose kit fitted with a rise or a kink — Why: when the machine is plumbed to a standpipe instead of using the tank, the hose has to run within the height the pump can lift; a hose looped over a worktop stalls it.
- A stuck tank-level float or switch — Why: the machine reads the tank as full whatever is in it, which is why an empty tank can still stop a cycle.
- The tank not pushed fully home — Why: a tank left proud does not engage its seat, so water goes into the cabinet instead of the tank.
- A failed condensate pump — Why: genuine, and it presents as a machine that fills its sump and stops without ever filling the tank, but it ranks last behind five simpler causes.
- Body: Ranked for a machine that collects its own water: First, The condensate tank is simply full: a ventless dryer fills its tank in a load or two, and the machine stops rather than risking an overflow. This is by far the most common cause and it is not a fault. Second, A blocked sump or condensate channel: lint that gets past the filters settles in the channel that carries water to the tank, so the tank stays empty while the machine reports water it cannot move. Third, The drain hose kit fitted with a rise or a kink: when the machine is plumbed to a standpipe instead of using the tank, the hose has to run within the height the pump can lift; a hose looped over a worktop stalls it. Fourth, A stuck tank-level float or switch: the machine reads the tank as full whatever is in it, which is why an empty tank can still stop a cycle. Fifth, The tank not pushed fully home: a tank left proud does not engage its seat, so water goes into the cabinet instead of the tank. Sixth, A failed condensate pump: genuine, and it presents as a machine that fills its sump and stops without ever filling the tank, but it ranks last behind five simpler causes.
What to check, in order
- slide out the tank and empty it, then push it firmly home, since a full tank explains most cases immediately.
- if the tank was empty when the machine complained, the water is not reaching it: look at the sump and the channel behind the filters.
- if the machine is plumbed to a drain rather than using the tank, check the hose height and route before anything else.
- listen for the condensate pump running briefly during a cycle; a silent pump with a wet sump is where owner checks stop.
- Body: Follow the water from the drum outwards: First, slide out the tank and empty it, then push it firmly home, since a full tank explains most cases immediately. Second, if the tank was empty when the machine complained, the water is not reaching it: look at the sump and the channel behind the filters. Third, if the machine is plumbed to a drain rather than using the tank, check the hose height and route before anything else. Fourth, listen for the condensate pump running briefly during a cycle; a silent pump with a wet sump is where owner checks stop.
Checks you can do yourself
- Switch the dryer off at its breaker, slide out the condensate tank and empty it — Tools: none — Time estimate: a few minutes
- Rinse the tank, check its float moves freely, and push it fully back into its seat — Tools: none — Time estimate: a few minutes
- Open the plinth or lower panel, withdraw the heat-exchanger filter and rinse it clear of lint — Tools: none — Time estimate: a few minutes
- Wipe the condensate channel behind the filter and clear any lint mat sitting in it — Tools: cloth — Time estimate: a few minutes
- If a drain hose is fitted, unclip it and check its whole run for a rise or a kink, then refit it — Tools: torch — Time estimate: a few minutes
- Body: All of this is reachable without tools: Switch the dryer off at its breaker, slide out the condensate tank and empty it (none; a few minutes). Rinse the tank, check its float moves freely, and push it fully back into its seat (none; a few minutes). Open the plinth or lower panel, withdraw the heat-exchanger filter and rinse it clear of lint (none; a few minutes). Wipe the condensate channel behind the filter and clear any lint mat sitting in it (cloth; a few minutes). If a drain hose is fitted, unclip it and check its whole run for a rise or a kink, then refit it (torch; a few minutes).
Safety first
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 heat-pump dryer contains a sealed refrigerant circuit: never puncture, bend or attempt to clean the finned exchanger with a tool, and do not tip the machine on its side, which can move oil into the circuit. Let the machine cool before opening the lower panel. unplug-before-service
When to stop and call a technician
These need the machine opened: The tank stays empty and the sump is wet after every cycle. The tank-full indicator stays lit with an empty, correctly seated tank. Water runs out of the cabinet base rather than into the tank. The condensate pump is silent throughout a full cycle. The tank stays empty and the sump is wet after every cycle The tank-full indicator stays lit with an empty, correctly seated tank Water runs out of the cabinet base rather than into the tank The condensate pump is silent throughout a full cycle
Nearest pages of the same kind
What this page does not cover
This page is generalized across every dryer sold under the Blomberg name: it separates neither the heat-pump models from the condenser models and one control generation from another, and it names no individual model. Where a family- or model-specific page exists it is linked here and it outranks this one for that machine; at present no page beneath this one narrows to a single family, so treat the ranking above as the brand-level pattern rather than a reading of your serial plate. For the other faults that turn up on this machine, start from Common Blomberg Dryer Problems.
Related pages
- Common Blomberg Dryer Problems
- Blomberg Dryer: Abnormal Noise or Vibration
- Blomberg Dryer: Does Not Clean or Dry
- Blomberg Dryer: Controls, Display or Error Code
- Blomberg Dryer: Cycle Will Not Run or Complete
- Blomberg Dryer: Door, Latch or Seal Fault
- Blomberg Dryer: Electrical, Fire or Gas Hazard
- Blomberg Dryer: Not Heating
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
