E37
Bosch Washing Machine
Severity: ModerateWhat Does This Error Mean?
Error code E37 on a Bosch washer means the pressure switch circuit has an open fault — the control board cannot read any signal from the pressure switch at all. The pressure switch (water level sensor) monitors how much water is in the drum. With no signal from the switch, the board has no way to know the water level and halts the cycle. This is different from E33 (conflicting readings) — E37 means there is no reading at all. This is usually a wiring fault or a completely failed pressure switch.
Affected Models
- Bosch Front-Load Washers
- Bosch Serie 4 washers
- Bosch Serie 6 washers
- Bosch Serie 8 washers
- Bosch WAx series models
Common Causes
- A failed pressure switch with an open internal circuit
- A disconnected or broken wire harness between the pressure switch and control board
- A severed or disconnected pressure hose removing all air pressure from the switch
- Corrosion on the pressure switch connector causing an open circuit
- A faulty main control board with a failed pressure switch input circuit
How to Fix It
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Perform a hard reset. Unplug the washer for 10 minutes and plug it back in. If the open circuit fault was caused by a momentary signal issue, the reset may restore communication with the pressure switch.
If E37 returns immediately, a physical fault needs to be found.
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Access the pressure switch by removing the top panel of the washer (usually 2-3 screws at the back). Locate the small round pressure switch — it will have a thin plastic tube connected to it and a wiring connector.
Always unplug the washer before removing any panels.
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Check the wire connector at the pressure switch. Disconnect and firmly reconnect it. Inspect the connector pins for corrosion or pins that have been pushed back into the housing.
Corroded pins create an open circuit at the connector even though the switch and harness are otherwise intact.
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Trace the wire harness from the pressure switch back to the control board. Look for any sections of wire that are pinched, broken, or disconnected. A broken wire in this harness will give a permanent open circuit reading.
The harness may run behind panels — follow it carefully and look for any points where it could have been pinched during a previous repair.
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Test the pressure switch. Disconnect the wire connector and the pressure hose. Set your multimeter to continuity and press the small switch button manually. You should hear a beep or see a reading change. No response means the switch is open and must be replaced.
Pressure switches cost $20-$50 online. Make sure to get the correct one for your model.
When to Call a Professional
E37 requires accessing the pressure switch, which is typically located at the top of the washer behind the top panel. The repair itself — replacing the switch and checking the harness — is straightforward. A technician can diagnose and repair E37 in about one hour for $100-$200.
Frequently Asked Questions
What is the difference between E33 and E37?
E33 means the control board is receiving a signal from the pressure switch, but the reading contradicts the board's own internal logic — a mismatch. E37 means the board is receiving no signal at all from the switch — an open circuit. E33 can be caused by a blocked hose or slow-responding switch. E37 points more directly to a broken wire or a completely failed switch.
Can I use the washer temporarily with E37?
No — without a water level reading, the washer cannot safely control the fill cycle. It may refuse to start, or on some models it may allow filling with no way to know when to stop, which risks overfilling. Do not use the washer until E37 is repaired.
How much does it cost to fix E37?
Reseating the connector: free. A replacement pressure switch: $20-$50. Wiring harness repair: $50-$200 depending on severity. A technician service call for diagnosis and repair: $100-$200 total.