E30
Bosch Dryer
Severity:What Does This Error Mean?
E30 on a Bosch heat pump dryer means the heat pump compressor has detected a fault. The heat pump is the core component that extracts heat from the exhaust air and recycles it — essential for energy-efficient drying. E30 requires a professional technician.
Affected Models
- Bosch WQB145B0GB
- Bosch WTH84000GB
- Bosch Serie 6 Heat Pump Dryer
- Bosch Serie 8 Heat Pump Dryer
Common Causes
- Heat pump compressor has failed or is failing
- Refrigerant charge low — heat pump circuit has a leak
- Compressor overheated due to blocked condenser or lint accumulation
- Compressor start capacitor failed
- Control board not sending the correct signal to the compressor
How to Fix It
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Clean the lint filter and condenser before calling.
A badly blocked condenser can cause the compressor to overheat and trigger E30. Clean both and attempt a restart — if E30 was caused by overheating, it may clear.
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Allow the dryer to cool for 30 minutes.
If the compressor overheated, allowing it to cool fully before restarting gives it the best chance of recovering.
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If E30 returns, call a Bosch technician.
Heat pump compressor faults require specialist diagnosis tools and refrigerant handling certification.
When to Call a Professional
E30 always requires a Bosch-authorised technician. Heat pump refrigerant circuits are sealed systems — only a certified technician can diagnose and repair them. Do not attempt to run the dryer while E30 is active.
Frequently Asked Questions
Is a heat pump dryer worth repairing if E30 appears?
It depends on the dryer age and the cost of repair. A compressor replacement is expensive — often 200-350 pounds for parts and labour. If the dryer is more than 8-10 years old, compare the repair cost against a new unit. For a dryer under 5 years old, repair is almost always worth it.
What is the difference between a heat pump dryer and a condenser dryer?
A condenser dryer uses a conventional electric element to heat air and a condenser to cool the exhaust air. A heat pump dryer uses a refrigerant circuit (like a fridge in reverse) to heat the air, making it 50-60% more energy efficient. Heat pump dryers take longer to dry but cost significantly less to run.