Raypak LOW 24VAC

What does Raypak LOW 24VAC mean?

Per the Error Display table, LOW 24VAC means low 24 VAC power and instructs checking the power supply wiring and transformer. The control requires a stable 24 VAC supply to operate its logic and outputs; the PIM low-voltage guidance states the input voltage must be above 18.0 VAC for proper operation. Below that, the control flags the fault to prevent unreliable operation.

Symptoms

• LOW 24VAC shown as the active error on the display
• Measured 24 VAC input below 18.0 VAC
• Red fault LED (5 flashes indicates low voltage fault on the PIM)
• Intermittent or failed control operation

Common causes

• Failing or undersized transformer
• Loose or damaged power-supply wiring
• Excessive load on the 24 VAC circuit
• Poor connections at the PIM power terminals

Diagnostic steps

1. 01

   Check the power supply wiring

   Per the Error Display table, inspect the 24 VAC power supply wiring for loose, damaged, or corroded connections.

2. 02

   Measure the 24 VAC input

   Per the PIM low-voltage guidance, verify the 24 VAC input voltage is above 18.0 VAC for proper operation.

3. 03

   Inspect and replace the transformer

   Check the transformer and replace it as necessary per the manual if the voltage is low.

4. 04

   Reset the control

   After restoring proper voltage, press and release the RESET button to clear the fault.

5. 05

   Observe operation

   Confirm the control operates normally and the low-voltage fault does not return.

When to call a professional

Measuring and correcting the 24 VAC supply involves working on live electrical components and possibly replacing a transformer, and the manual warns that wiring errors cause improper and dangerous operation. If you are not comfortable safely measuring voltage on a live circuit or identifying the correct replacement transformer, have a qualified Raypak service technician diagnose and repair the power supply.