EVCO AL09 Error Code

What does EVCO AL09 mean?

AL09 on the Evco SAVE AHU controller (144SAVEU0E01) is a supply fan running hours notification. The controller counts the total hours of supply fan operation and activates AL09 when accumulated hours exceed the configured maintenance threshold. This is a signaling-only alarm — no AHU outputs are affected. AL09 requires a manual reset by the operator after scheduled fan maintenance is performed.

Symptoms

• AL09 displayed on the SAVE AHU controller.
• AHU continues operating normally — fan and all outputs remain active.
• Supply fan has reached or exceeded the programmed maintenance hour limit.
• Alarm persists until manually acknowledged and the hour counter is reset.
• Alarm relay may activate to notify the building management system.

Common causes

• Supply fan has accumulated hours beyond the configured preventive maintenance interval.
• Maintenance interval parameter set too low relative to the site's PM schedule.
• Previous maintenance visit did not reset the hour counter.
• Fan operates continuously rather than cycling, accumulating hours faster than expected.

Ask the AskWhiz AI about EVCO AL09

AskWhiz

online

Hi — I'm the Refrigeration demo. Ask me anything in this domain.

What causes EVCO AL09?Step-by-step fix for EVCO AL09?Is EVCO AL09 safe to ignore?

MessageHelp me troubleshoot EVCO AL09

Diagnostic steps

1. Record the fan runtime hours in the maintenance log

   Note the total accumulated hours from the controller display or alarm history. This data is required for maintenance documentation and warranty records.

2. Perform supply fan preventive maintenance

   Inspect the supply fan wheel or impeller for dirt buildup and clean if fouled. On belt-drive units, inspect belt condition and tension, replace worn belts, and verify sheave alignment. Check motor bearings for noise or play.

3. Lubricate motor bearings if applicable

   Apply the correct grease to motor bearing ports per the motor manufacturer's specification. Do not over-grease — excess lubricant causes bearing overheating. Sealed-bearing motors do not require lubrication.

4. Reset the supply fan hour counter

   Access the controller maintenance or timer menu and reset the AL09 hour counter to zero. The alarm should clear immediately after reset.

5. Adjust maintenance interval if required

   Review the configured maintenance interval and adjust to align with the site's PM schedule. Typical commercial AHU supply fan intervals range from 2,000 to 4,000 hours depending on environment and duty cycle.

When to call a professional

AL09 is a preventive maintenance prompt that does not indicate an active failure. However, if the fan inspection during maintenance reveals significant bearing wear, impeller imbalance, or belt deterioration, engage a licensed HVAC technician to carry out the repairs before returning the AHU to service. Ignoring runtime alerts leads to progressive mechanical failure and potential AL01 thermal overload events.