Indesit Washer Error Code F08

The F08 error code on an Indesit washer indicates a fault within the wash heating circuit, specifically involving either earth leakage from the heating element or sticking relay contacts on the control module. The heating element relay is responsible for switching power to the wash heater during the appropriate cycle phases. When the control board detects an anomaly in this relay circuit, whether from current leaking to ground through a degraded heater or from relay contacts that have welded together and fail to open, it logs F08 and typically halts the wash program to prevent further damage or safety risk.

The insulation resistance of a healthy heating element should measure at least 2 MOhm between each terminal and the machine chassis ground. A reading below this threshold indicates the element's internal insulation has broken down, allowing current to leak toward ground. This is a common failure mode in older heaters exposed to repeated thermal cycling and scale buildup. Sticking relay contacts are a separate but related failure where the relay on the PCB remains closed after the heating phase ends, causing the heater to run continuously and potentially triggering thermal cutouts or overheat conditions.

Diagnosis should begin by inspecting all wiring connections at the pressure switch, heater terminals, and control module for corrosion, looseness, or burn marks. Following the connection check, an insulation resistance test across each heater terminal to ground with a multimeter or megohmmeter will confirm whether the element itself has failed. If the heater passes the insulation test, attention should shift to the relay contacts on the control module, which may require board-level inspection or replacement of the PCB assembly.