Before you call anyone about error code displayed on a Bosch dryer, it pays to know which failures are common and which are rare — that alone usually points to the fix.
What it usually means#
Most likely: e:02 — motor/drive fault. Under the hood, the EcoSilence Drive motor is not responding to the control board. Could be motor breakdown, broken belt triggering motor overload protection, or inverter circuit breakdown on the control board. If that checks out, look next at e:03 — ntc temperature sensor fault.
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Where to look first#
These are the failures behind most of these calls, ordered by how often they show up:
| Likely cause | How common | What you'll notice / what to check |
|---|---|---|
| E:02 — Motor/Drive Fault | Most common | The EcoSilence Drive motor is not responding to the control board. |
| E:03 — NTC Temperature Sensor Fault | Common | One of the NTC temperature sensors reads out of range (open circuit or short). |
| E:04 — Heat Pump Fault (WTW series only) | Fairly common | The heat pump compressor or refrigerant circuit has a fault. |
| E:08 — Condensate Tank Full | Occasional | The condensate collection tank is full and must be emptied. |
| E:09 — Communication Error | Less common | Communication breakdown between the main control board and the display/user interface board. |
| E:18 — Drain Timeout | Uncommon | The drain pump has been running for the maximum allowed time without successfully emptying the condensate. |
What to inspect, in order#
Take the causes above one at a time, starting at the top of the table.
1. E:02 — Motor/Drive Fault#
The EcoSilence Drive motor is not responding to the control board. Could be motor fault, broken belt causing motor overload protection, or inverter circuit fault on the control board. Diagnosis: Examine if drum turns by hand (belt intact?). Listen for a hum without movement, which usually means the motor or its start components have failed.
2. E:03 — NTC Temperature Sensor Fault#
Put simply, one of the NTC temperature sensors reads out of range (open circuit or short). Bosch dryers have 2–4 NTC sensors monitoring inlet air, exhaust air, condenser, and drum temperatures. Diagnosis: Access sensors . Unplug and measure the sensor’s resistance against spec; a reading far off (open or shorted) confirms it.
3. E:04 — Heat Pump Fault (WTW series only)#
Commonly triggered by: lint-clogged condenser setting off compressor overheat, refrigerant weeps (no heating capacity), or compressor start fault. Diagnosis: Clean the condenser first (pull out from front bottom, vacuum fins). The heat pump compressor or refrigerant circuit has a fault. Inspect the pump for a trapped object and confirm it spins freely before condemning the motor.
4. E:08 — Condensate Tank Full#
In practice, the condensate collection tank is full and must be emptied. Or, if direct-drain is connected, the drain path is blocked. Diagnosis: Pull out and empty the condensate tank. With the unit unplugged, inspect this part for visible wear or a loose connection and test it before replacing.
5. E:09 — Communication Error#
Communication breakdown between the main control board and the display/user interface board. Ribbon cable or connector issue. Diagnosis: Remove top panel. Rule it in or out with a visual check and a continuity test where possible.
6. E:18 — Drain Timeout#
What happens: the drain pump has been running for the maximum allowed time without successfully emptying the condensate. Pump is blocked, failed, or drain path restricted. Diagnosis: Access drain pump (front lower panel). Clear the pump filter and check the impeller for debris; a jam stalls the pump and stops drainage.
Safety First — Know the Risks
Gas dryers carry carbon monoxide and explosion risk. Even electric dryers involve 240V circuits that can deliver a fatal shock. Our techs are licensed and insured — let them handle the risk.
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Error code quick reference#
Write down the exact code before you clear it — it is your fastest route to the failed subsystem.
| Code | What it means and what to do |
|---|---|
E:02 | The EcoSilence Drive motor is not responding to the control board. Could be motor fault, broken belt setting off motor overload protection, or inverter circuit fault on the control board. |
E:03 | One of the NTC temperature sensors reads out of range (open circuit or short). Bosch dryers have 2–4 NTC sensors monitoring inlet air, exhaust air, condenser, and drum temperatures. |
E:04 | The heat pump compressor or refrigerant circuit has a fault. Commonly triggered by: lint-clogged condenser setting off compressor overheat, refrigerant weeps (no heating capacity), or compressor start fault. |
E:08 | The condensate collection tank is full and must be emptied. Or, if direct-drain is connected, the drain path is blocked. |
E:09 | Communication breakdown between the main control board and the display/user interface board. Ribbon cable or connector issue. |
E:18 | The drain pump has been running for the maximum allowed time without successfully emptying the condensate. Pump is blocked, failed, or drain path restricted. |
Quick recap#
If you only remember one thing, work the causes in this order:
- E:02 — Motor/Drive Fault — most common; spin the affected part by hand with power off — grinding, drag, or a burnt smell points to the motor.
- E:03 — NTC Temperature Sensor Fault — common; a drifted sensor reports the wrong value to the board, so compare its resistance to the service spec before replacing.
- E:04 — Heat Pump Fault (WTW series only) — fairly common; clear the pump filter and check the impeller for debris.
- E:08 — Condensate Tank Full — occasional; rule it in or out with a visual check and a continuity test where possible.
- E:09 — Communication Error — less common; with the unit unplugged, inspect this part for visible wear or a loose connection and test it before replacing.
The Real Cost of DIY
Average DIY attempt: $150-400 in tools you may use once, plus the risk of further damage. Our diagnostic visit costs $0 — we find the problem and give you an honest quote.
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What fixing it usually involves#
Most repairs here come down to isolating the bad component, replacing it with the correct part for your model, and confirming the symptom is gone on a test run. Expect the e:02 — motor/drive fault to be first in line.
Keeping it from coming back#
A little routine care goes a long way: keep the dryer clean, level, and free of buildup, and this symptom is far less likely to return.
Don't Void Your Warranty
Opening your appliance yourself may void the manufacturer warranty. Our repair comes with a 90-day guarantee, and we document everything for warranty compliance.
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When to bring in a technician#
Call a technician if the symptom persists after the checks above, if the repair means reaching power, gas, or sealed components, or if your Bosch dryer is still under warranty — DIY work can void it. Actual cost depends on which part is at fault and your model, so a quick diagnostic settles it before any work starts.
Still stuck after these checks? Book an EasyBear technician — we service Bosch dryers and carry the common parts on the truck.
Appliance Repair Technician · 8 years experience
Experienced technician with 8 years specializing in dishwasher repairs and European appliance brands including Bosch and Thermador.
