EVCO F1 Error Code

What does EVCO F1 mean?

The F1 code on Evco refrigeration controllers signals a fault with the condenser temperature probe. The controller detects that the condenser probe circuit is open or shorted and activates the alarm output. Regulation continues using fallback logic, but condenser-based protection functions such as the high condensation warning and compressor fan control based on condenser temperature are disabled until the probe is restored.

Symptoms

• F1 displayed continuously on the controller screen.
• Alarm relay output activates, triggering any connected audible or visual alarm.
• Condenser fan speed may default to a fixed setting rather than following temperature.
• COH (condenser overheated) alarm becomes inactive because the probe reading is unavailable.
• Refrigeration regulation continues but without condenser temperature feedback.

Common causes

• Condenser probe connector is loose or has pulled free from the controller terminal.
• Condenser probe wiring is broken or corroded, causing an open circuit.
• Probe resistance has drifted outside the valid range due to physical damage or heat exposure.
• Wrong probe type installed — controller parameter P0 expects PTC but NTC is wired, or vice versa.
• Controller input circuit board fault preventing valid signal reading.

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Diagnostic steps

1. Power down and inspect probe wiring

   Switch the unit off at the mains. Trace the condenser probe cable from the probe head to the controller terminal block, looking for pinched, cut, or corroded conductors.

2. Check probe resistance at the controller terminals

   With the probe disconnected, measure resistance across the probe leads using a multimeter. For a PTC probe at 25 °C expect approximately 990 Ω; for NTC expect the value specified in the controller datasheet. An open-circuit (OL) or near-zero reading confirms probe failure.

3. Verify probe type matches parameter P0

   Access the controller configuration menu and confirm that parameter P0 matches the installed probe type (1 = PTC, 2 = NTC). A mismatch causes the controller to interpret a valid probe signal as a fault.

4. Reseat or replace the probe

   Reconnect the probe connector firmly at the terminal block. If resistance was out of range, replace the condenser probe with the manufacturer-specified sensor and re-route the cable away from high-heat surfaces.

5. Restore power and confirm alarm clearance

   Power the controller back on. The F1 alarm should clear automatically once a valid probe reading is detected. If the alarm persists after probe replacement, contact the Evco sales network.

When to call a professional

Call a licensed refrigeration technician if probe replacement does not clear F1, if the condenser probe input terminal on the controller board shows signs of burning or corrosion, or if the system has been running without condenser temperature feedback for an extended period and shows signs of high-pressure damage such as tripped safeties or compressor overheating. Board-level controller repair requires certified service.