Bosch Dryer Error Code E:4

E:4 is a time error indicating the drying cycle exceeded the maximum allowed run time without completing. The dryer triggers this fault as a protective measure to prevent it from running indefinitely. It can result from an oversized load, an incorrect program selection, or a fault in the compressor circuit that reduces the machine's ability to remove moisture from the drum.

A reset may clear the displayed error code temporarily, but it will not resolve an underlying hardware fault. If the compressor circuit or overload protector has failed, E:4 will return as soon as the dryer attempts another cycle. A reset is worth trying after reducing the load, but persistent errors require component-level diagnosis.

If the fix is simply adjusting load size or program selection, there is no cost involved. Replacing a compressor overload protector switch typically falls in the range of $50 to $150 including parts and labor, depending on the specific model and service rates in your area. A compressor replacement is a more significant repair and costs considerably more, generally in the range of $200 to $500 or higher.

Start by reducing the size of your load and selecting the appropriate drying program for the fabric type, then run the cycle again. If the error clears, an overloaded drum was the cause. If E:4 returns with a normal load, the compressor overload protector switch or broader compressor circuit should be inspected and tested by a qualified technician.

The dryer stops itself when E:4 triggers, so it is not actively running in a dangerous state. However, continuing to use the machine without addressing the root cause is not advisable if the error is related to a compressor fault. Repeated operation with a faulty compressor circuit can cause additional damage to related components.