Huebsch QN Washer-Extractor Error Code Eio 33: Mosfet Enable Failure

What does Huebsch error code Eio 33 mean?

The Mosfet enable is an electronic switch that allows the board's outputs to work at all. Eio 33 differs from the pin message Eio 29. In this case the circuit itself, not just the pin that drives it, showed a hardware failure in its test. The control found it not behaving as expected and blocks every output, which means no valves, door lock or other loads can run. Operators see a washer that does not start, with the code on the display. The board is the main suspect. After it come the supply voltage reaching the board, signs of moisture or heat damage, and the connections to the user control. Since the check is internal to the board, restarting the machine rarely helps beyond showing whether the failure is steady. A laundry room with steam and lint can contribute by dampening the board over time, so a technician will look for residue as well as measuring the circuit.

Affected models and control systems

This applies to Huebsch QN-series washer-extractors in the CHM1792C family, 20 to 100 lb, with the front-end control in that programming manual.

Code numbers and their meaning can change between control generations. We match the full model and control before acting on a code.

What you may notice

• The washer-extractor does not start and shows Eio 33
• No fill, drain or lock action occurs
• The display keeps the code after a restart

Possible causes

Listed in Huebsch's documentation

• Mosfet enable stage failing
• Supply voltage to the board unsteady
• Moisture or heat damage on the board
• Connections to the user control loose

Other likely causes — what usually sits behind error code Eio 33 on this control. A technician confirms which one it is before any part is replaced.

• Steam and lint residue creeping into the control housing over months
• A power surge that stressed the enable stage on the board

Safe checks before calling for service

How a technician diagnoses error code Eio 33

1. Read the code and history, and confirm Eio 33 returns after a power cycle.
2. Measure the supply voltage to the board.
3. Inspect the board for moisture, burn marks and loose connectors with the power locked off.
4. Reseat the user control connections and retest.
5. Replace the input and output board once supply and connections are proven good.

How error code Eio 33 differs from similar codes

Eio 33 is the hardware test of the enable circuit. Eio 29 is its pin check, and Eio 38 and Eio 39 report that it cannot be switched on or off.

Technical reference

Document

Washer-Extractor Programming CHM1792C_SVG, Part No. F8641001ENR4, Error Codes Table 29 (pp. 100-107)

Edition

Part No. F8641001ENR4, January 2020

Models / control

CHM1792C family washer-extractor (QN models, 20-100 lb) front-end control

Section

Error Codes, Table 29, pp. 100-108 (PDF pages equal printed pages)

Checked

October 2026

We use the maker's document to read the code and do not reproduce it. Always confirm the complete model and control before applying these steps.