Raypak BLOW SPEED

What does Raypak BLOW SPEED mean?

Per the Error Display table, BLOW SPEED means the blower speed is out of range, and the manual instructs to check the blower wiring and the blower. The control monitors the blower's tachometer feedback to confirm it is running at the speed required for safe combustion; when the feedback is missing or outside the expected range, the control flags the fault. The PIM logs this as a blower speed fault.

Symptoms

• BLOW SPEED shown as the active error on the display
• Blower not reaching or holding required speed
• Red fault LED (11 flashes indicates blower speed fault on the PIM)
• Heater will not complete its ignition sequence

Common causes

• Faulty or failing blower motor
• Tachometer signal wiring fault at the PIM (terminals J5)
• Supply power below the heater's minimum required level
• Obstructed or binding blower

Diagnostic steps

1. 01

   Check the blower wiring and blower

   Per the Error Display table, inspect the blower and its wiring for damage, loose connections, or obstruction.

2. 02

   Verify the tachometer signal

   Per the PIM blower-fault guidance, verify the tachometer signal and the connections at terminals J5 on the PIM.

3. 03

   Confirm supply power

   Confirm power to the heater is at or above the minimum required level per the manual.

4. 04

   Reset the control

   After correcting the blower and wiring, press and release the RESET button to clear the fault.

5. 05

   Observe operation

   Confirm the blower reaches the required speed and the heater completes ignition without the fault returning.

When to call a professional

Blower diagnostics involve the combustion air system and tachometer feedback, where incorrect operation affects safe combustion. The manual requires gas off and electrical power disconnected before servicing components, and replacing a blower is a parts-level repair. If verifying the tachometer signal and supply power does not resolve the fault, have a qualified Raypak service technician inspect or replace the blower.