UniMac Washer Error Code E nFLo: No Water Flow
E nFLo on a UniMac QN washer-extractor means the control waited five minutes and the water never reached the basket level. Open both supply valves at the wall, look at the hoses for kinks, and restart the machine. If the code returns on a short test cycle, a fill valve or inlet screen needs a technician.
Medium: the cycle stops until water flow is restored, but it is often a closed valve you can check yourself.
What does UniMac error code E nFLo mean?
E nFLo is the no water flow check on UniMac QN washer-extractors such as the UCA020QN. The control starts a timer when a fill step begins and watches the level input. If five minutes pass and the water has not even reached the basket, the control decides that very little water is coming in and stops the cycle with the message E nFLo. This is an early warning. The logic is simple: valves open, water flows, level rises. When the level does not move at all, the likely reasons are a closed supply valve, a clogged inlet screen, a fill valve that does not open or a kinked hose. Because the control only watches the level, it cannot say whether the hot line, the cold line or both are short of water.
Affected models and control systems
This code is listed for the CHM1792C family of UniMac QN washer-extractors (20-100 lb), with the UCA020QN as the example model in the manual. It comes from the front-end control on those QN machines.
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 cycle stops early in a fill step and the display shows E nFLo
- No sound of water running, or only a weak trickle at the inlet
- The basket stays dry or nearly dry after several minutes
Possible causes
Listed in UniMac's documentation
- Hot or cold supply valve closed at the wall behind the washer
- Clogged inlet screen at a fill valve slowing the water
- Fill valve that does not open, so little water enters
- Kinked supply hose restricting flow into the machine
Other likely causes — what usually sits behind error code E nFLo on this control. A technician confirms which one it is before any part is replaced.
- Building water shut off for plumbing work, so neither hot nor cold line has pressure
Safe checks before calling for service
- Disconnect and reconnect power to clear the code.
- Open both hot and cold water supply valves at the wall all the way.
- Look along the supply hoses for kinks or a hose pressed against the wall.
- Start a short cycle and watch for water entering. If E nFLo returns, call us.
How a technician diagnoses error code E nFLo
- Read the code and note which fill step was running and whether the no water flow check is enabled in the machine's program.
- Confirm supply pressure at both inlets with the hoses attached and then disconnected, and check that the building has water.
- Remove the hoses and inspect the inlet screens at each fill valve for sediment and scale.
- With the machine energized, command a fill and check for the proper voltage at each valve coil, then check coil resistance.
- Clean the screen or replace a fill valve only after the tests point to it, then run a full fill.
- Valve coils and the control outputs carry line voltage behind the panels, and testing them live is work for a trained technician.
- A blocked screen, a dead fill valve and low building pressure all give the same display, so telling them apart takes pressure and voltage readings.
How error code E nFLo differs from similar codes
E nFLo is the early five-minute warning of low flow. The longer fill timeout error is a separate code that appears only if the level is still not reached after much longer.
Technical reference
- Document
- Washer-Extractor Programming CHM1792C_SVG, Part No. F8641001ENR4, Error Codes Table 29 (pp. 100-107)
- Maker documentation
- UniMac owner support
- 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 UniMac washer error codes
Can I keep using the washer if E nFLo goes away after a restart?
If the supply valves were the reason, yes. If the code returns on the next fill, stop using the machine, because pumping and heating cycles should not run with too little water.
Is E nFLo the same as the fill timeout error?
No. E nFLo comes after five minutes with almost no water, while the fill timeout error comes after a much longer wait. The shorter one points toward supply or valve trouble sooner.
Could the building water just be off?
Yes. Try another tap; if the building is dry, the washer is fine.
Need help with UniMac error code E nFLo?
A technician confirms the cause on site and gives you the price in writing before any work starts.