Speed Queen CHM1792C Washer Error Code E LP: Low Level Switch
E LP on a CHM1792C heat-model washer-extractor is a low level pressure switch error that normally shows only during the built-in test cycle. If it appears on a machine in service, keep customers away from it and call us with what the display showed.
Medium: the cycle stops, and a failed level switch needs checking before more loads are run.
- Code
- E LP
- Maker
- Speed Queen
- Equipment
- Washers
- Applies to
- CHM1792C family washer-extractor (QN models, 20-100 lb) front-end control
What does Speed Queen error code E LP mean?
The CHM1792C has a built-in test cycle used when a machine is first built or tested, and E LP is reported by the control during that cycle on heat-model washer-extractors. Owners rarely see it. The code means the low-level pressure switch circuit is not reading the way the control expects for that step, so the cycle stops. If it does appear on a machine in service, the first question is simple: did anyone start a test cycle by mistake? A test cycle selected by accident would explain a message that normal laundry cycles never produce. If not, the circuit itself is suspect: a low level pressure switch or its air tube that has failed, wiring on the switch that is broken or loose, or a control input that misreads the switch. The air tube that links the switch to the tub is a thin part, and it is easy to disturb during cleaning, which is a reason to leave tubing alone.
Affected models and control systems
This page covers CHM1792C family heat-model washer-extractors, the QN models from 20 to 100 pounds. Other controls report level switch trouble with different codes.
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
- E LP appears during what looks like a test run
- The cycle stops without washing a load
- The door stays shut until the lock releases
Possible causes
Listed in Speed Queen's documentation
- A low level pressure switch or its air tube that has failed
- Broken or loose wiring on the pressure switch
- The built-in test cycle being selected by mistake
- A control input that misreads the pressure switch
Other likely causes — what usually sits behind error code E LP on this control. A technician confirms which one it is before any part is replaced.
- An air tube that has slipped off its fitting after a cleaning or a nearby repair
- Moisture in the air tube that leaves the switch stuck in one position
Safe checks before calling for service
- Think back to whether anyone started a test cycle on this machine.
- Leave tubing and the cabinet untouched.
- The door stays shut until its lock releases.
- Call us and tell us what the display showed, and keep customers away from the machine meanwhile.
How a technician diagnoses error code E LP
- Read the code and ask whether a test cycle was selected on purpose.
- Confirm the machine returns to normal cycles after a reset.
- Inspect the air tube from the low level switch to the tub for kinks, leaks and water.
- Check the switch wiring and measure its state against a known level.
- Replace the switch or tube only after it fails the test.
- The pressure switch circuit is wired into the control behind the panels, and live readings need a trained technician.
- The built-in test cycle runs the machine with its own sequence, which should be left to someone trained on it.
- Separating a failed switch from a bad control input takes meter readings at the right step.
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.
Related Speed Queen washer error codes
Is E LP common?
No. It normally appears only in the built-in test cycle, so seeing it in normal service is unusual.
Could I have caused it by starting a test cycle?
Possibly. If a test cycle was started by mistake, the code may be the only effect.
Can I use the washer afterward?
If normal cycles run clean after a reset, it can run, but report it if E LP returns.
Need help with Speed Queen error code E LP?
A technician confirms the cause on site and gives you the price in writing before any work starts.