Why a Bosch Washer Shows Er:08 When the Heater Ran Past Its Allowed Time

What Er:08 means

Er:08 is logged when the heater has stayed on longer than the program permits and the control could not shut it off. The documented suspects are a damaged element and a relay stuck in the on position, and the repairs mirror Er:07: test the element for leakage to ground and replace it if it is bad, or replace the control board.

Common causes of Er:08

Relay fused in the on position on the control board
Element damaged, with current leaking to ground
Electronics that cannot interrupt the heater supply

✓ One safe check you can try

1. Switch off the washer at the circuit breaker and leave it off. 2. Don't try another cycle to see what happens. 3. Take any wet laundry out only after the drum has cooled and the door lock has released. This code and its companion Er:07 describe a heating circuit that doesn't answer the control, so unpowered is the safe state.

! Why to stop there

A heater that cannot be turned off will keep raising the water temperature, which can warp the tub and seals.
Opening the cabinet to look at the element exposes mains wiring beside standing water.
Replacing only the element fails to cure a stuck relay, and the next heater will be at the same risk.

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

→Same appliance

Other Washer codes

dr:15Bosch Washer dr:15 Gives an Early Warning From the Power Limiter dr:19Bosch Washer dr:19 Shows That the Motor Phases Don't Match dr:20Bosch Washer dr:20 Signals a Shorted Inverter Output Stage dr:21Sustained High Voltage and Bosch Washer dr:21 dr:22Bosch Washer dr:22 Reports Failure of the Inverter's Own Temperature Sensor dr:02Bosch Washer dr:02 Indicates an Inverter Power Switch That Is Open dr:06Bosch Washer dr:06 and the Inverter's Temperature Protection dr:08A Bosch Washer With dr:08 Has a Drum Speed Sensor Problem

Er:08Er:08 questions

How is Er:08 different from Er:07?

Er:07 sees the water warming with the heater commanded off. Er:08 sees the heater staying on beyond its time limit. The causes overlap, so both call for the same cautious response.

Can I tell whether it is the element or the board myself?

No. It takes an insulation test on the element and a check of the relay on the control. We carry out both and quote before we replace anything.

Should I be concerned about the clothes inside?

Wait until the drum cools. Hot water can scald when you pull the filter or hose, and the door lock may stay engaged until the machine has cooled.