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.

What does EVCO AL mean?

The AL alarm on Evco EV3-series and EVK-series controllers indicates that the cabinet or room temperature has dropped below the low-temperature alarm threshold.

What does EVCO AH mean?

The AH alarm on Evco EV3-series and EVK-series controllers signals that the cabinet or room temperature has risen above the high-temperature alarm threshold.

What does AH (high temperature alarm) mean on an EVCO controller?

AH signals that the cabinet temperature has risen above the high-temperature alarm threshold (setpoint plus parameter A4) for longer than the configured delay. Refrigeration regulation continues; AH is a notification that resets automatically once temperature returns within the alarm band. Common causes are a fouled condenser, a stuck-open door, low refrigerant charge, or A4 set too narrow for the application. Inspect the condenser fan and coil first — dirty condensers are the most common driver — then verify door seals and product loading before adjusting parameter A4.

What does AL (low temperature alarm) mean on an EVCO EV3 or EVK controller?

AL flags that the cabinet temperature has dropped more than parameter A1 below setpoint for longer than the configured delay. Regulation is not interrupted — AL is a warning that resets automatically once temperature recovers. Frequent AL events usually mean A1 is too narrow for normal pull-down or defrost recovery, the door has been left open, defrost heaters are over-running, or the evaporator is iced over and reading erratically. Check the displayed temperature against an independent thermometer first to rule out a faulty probe.

What does COH mean on an EVCO refrigeration controller?

COH stands for Condenser Overheated and activates when the condenser probe reads above parameter C6. Regulation continues, but if the condenser temperature climbs further to C7 the controller escalates to CSd (Compressor Shut Down) and stops the compressor to protect it. The most common causes are a dirty condenser coil, a failed condenser fan or capacitor, blocked airflow clearances, and high ambient room temperature. Power down, brush the coil clean, verify all condenser fans spin freely, and confirm fan capacitors are within tolerance before adjusting C6.

What does AL01 mean on an EVCO C-PRO RACK or SAVE AHU controller?

AL01 has different meanings by family. On the C-PRO RACK refrigeration controller, AL01 is a compressor 1 thermal overload — the motor drew excess current and the overload contact opened. On the SAVE AHU controller, AL01 is a supply fan thermal overload that switches all AHU outputs off. Both alarms require the motor to cool 15–20 minutes before reset. Inspect the condenser or filters and dampers, test run capacitors, megger motor windings, and check fan belt condition before resetting; clearing the alarm without finding the root cause causes immediate re-trip.

Quick Answer

EVCO controllers use family-specific code dictionaries. On EV3 / EVK refrigeration controllers, Pr1–Pr3 flag probe faults, AH and AL mark high and low temperature alarms, COH warns of condenser overheating, and PF logs power-failure events. On C-PRO RACK and SAVE AHU controllers, AL01–AL77 cover compressor and probe alarms, F21–F24 mark fan thermal trips, and E01–E304 indicate vector-drive faults.

refrigeration

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By Nichita Herput

Co-founder & CEO · Reviewed May 2026

What error codes does EVCO display?

will have no effect the alarm output will be activated CONDENSER Condenser probe

displayed · No effect on regulation Set the right time. If the error persists, r

displayed No effect on regulation (A1-A11) Wait until the temperature read by. [

is recorded (A4+A11) · If i2 = -1 the alarm is disabled; Check i2 and iP1 [Check

COH

displayed cSd High condensation|Condenser temperature > Condenser temp. > c6 C7

AL31

High discharge pressure C1 Auto ON all fans AL36 High suction pressure C1 Auto O

AL41

Low discharge pressure C1 Auto OFF all fans Delay able to be set * AL46 Low suct

AL11

High discharge pressure pressure regulatorC1 Set OFF all comp. AL21 Low suction

AL61

Liquid level C1 Manu Visualization Delay able to be set ACC1 Common oil differen

F21

Thermal fan 1 Set OFF fan 1 AF22 Thermal fan 2 Set OFF fan 2 AF23 Thermal fan 3

F24

Thermal fan 4 Set OFF fan 4 AF01 Hours of operation fan 1 Auto Visualization AF0

F03

Hours of operation fan 3 Auto Visualization AF04 Hours of operation fan 4 Auto V

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