The F57 error on your Bosch washing machine points to a fault in the heating circuit — specifically involving the heating relay on the control board or the heating element itself. Unlike a simple sensor error, F57 often indicates that the control board has detected a problem with how power is being delivered to the heater. This error requires some investigation, but in many cases replacing one affordable component restores full function.
What Does the F57 Error Mean on a Bosch Washing Machine?
The F57 error is a heater relay or heating circuit fault. The control board on a Bosch washing machine uses a relay — an electrically controlled switch — to route mains power to the heating element. When the board sends a signal to heat but does not detect the expected current draw from the element (because the relay has failed to close, or the element is open-circuit), it logs F57. This stops the wash cycle because the water cannot be heated to the selected temperature, which would leave laundry inadequately cleaned.
Common Causes of the F57 Error
- Failed heating relay on the control board: The relay contacts weld shut (fails closed — constant heating) or burn open (fails open — no heating). A failed relay is the most common cause of F57 on Bosch machines over 5 years old.
- Burnt-out heating element: The resistive heater coil develops an open circuit, so the relay closes correctly but no current flows — the board detects zero current and logs F57.
- Limescale-coated heating element: Thick limescale causes the element to overheat, eventually burning through the coil — particularly in hard water regions of India.
- Wiring fault between relay and element: A broken or burnt wire in the heater circuit prevents current from reaching the element even when the relay operates correctly.
- Tripped thermal cutout: Some Bosch models have a thermal fuse (thermal cutout) in the heater circuit that blows when the element overheats. A blown cutout breaks the heater circuit and causes F57.
How to Fix the F57 Error: Step-by-Step
Step 1: Perform a soft reset
Turn off the washing machine and unplug it for 1–2 minutes, then restart. A transient voltage spike can cause the control board to misread the heater circuit and display a false F57. If the error does not return on the next hot or warm cycle, no further action is needed.
Step 2: Descale the heating element
Run an empty 60°C or 90°C cycle with a washing machine descaler or 500 ml of white vinegar. In hard water areas, limescale on the element causes overheating and can eventually trigger the thermal cutout. Descaling monthly is the single most effective preventive measure against F57 on Bosch machines used with hard water.
Step 3: Test the heating element with a multimeter
Unplug the machine and remove the back panel. Locate the heating element — a U-shaped or flat metal component at the base of the drum. Disconnect the two element terminals. Set a multimeter to resistance (Ohms). A healthy Bosch heating element reads 20–35 Ohms. An open circuit (OL) confirms a burnt-out element. A replacement Bosch heating element costs ₹600–₹1,500 online.
Step 4: Check the thermal cutout (thermal fuse)
On models equipped with a thermal cutout, it is usually clipped to the heating element or mounted nearby on the heater housing. Test it with a multimeter on continuity mode — it should read continuity (beep or near-zero Ohms). No continuity means it has blown and needs replacement. A Bosch thermal cutout costs ₹150–₹400 online.
When to Call a Bosch Service Technician
If both the heating element and thermal cutout test fine but F57 persists, the heating relay on the control board has likely failed and the board needs professional repair or replacement. Contact Bosch India customer care (1800 266 1880) or an authorised service centre. Control board relay replacement or board replacement typically costs ₹3,500–₹10,000 including labour.
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Frequently Asked Questions
Can the F57 error appear without an actual fault?
Occasionally a power surge during a heating phase can cause the board to log F57 falsely. A soft reset resolves these instances. However, F57 is more often a genuine heater circuit fault — especially on machines over 4–5 years old or those used predominantly on hot cycles with hard water. Test the element with a multimeter if the error recurs.
How much does it cost to fix the F57 error in India?
A replacement heating element costs ₹600–₹1,500 online; a thermal cutout costs ₹150–₹400. DIY repair of the element or cutout is feasible for confident home repairers. Control board replacement at an authorised Bosch service centre costs ₹3,500–₹10,000 including labour and a call-out fee of ₹500–₹1,500.
Does Bosch’s warranty cover the F57 error?
Bosch’s 2-year warranty covers manufacturing defects in the heating element, thermal cutout, and control board relay. Heater failure caused by limescale damage — a maintenance issue — is typically not covered. If you are in the warranty period and have been descaling as recommended, contact Bosch India with your proof of purchase for a warranty assessment.
Related Bosch Washing Machine Errors
E17 Error (Water Not Filling) | E3 Error (Door Not Closed) | E23 Error (Drain Pump) | F21 Error (NTC Sensor)