Raypak GAS PRESS

What does Raypak GAS PRESS mean?

The controller's Error Display lists GAS PRESS with the instruction to check PIM wiring, indicating the control is not seeing a valid gas-pressure or PIM input. The unit cannot confirm acceptable gas supply conditions for a safe ignition sequence, so it flags the error. The manual notes incoming dynamic gas pressure must not be less than the rated minimum for the fuel in use.

Symptoms

• GAS PRESS displayed as the active error on the controller
• Heater will not progress through the ignition sequence
• Possible no-heat condition
• Red fault LED on the PIM

Common causes

• Loose or miswired PIM connections
• Low incoming dynamic gas pressure below the rated minimum
• Closed or partially closed manual gas valve
• Gas pressure switch wiring fault (if equipped)

Diagnostic steps

1. 01

   Check PIM wiring

   Per the manual's Error Display table, inspect the PIM wiring associated with the gas pressure input for loose, missing, or miswired connections.

2. 02

   Verify incoming gas pressure

   Confirm the dynamic gas pressure to the gas valve is not below the manual's rated minimum for natural gas or propane.

3. 03

   Confirm the manual gas valve is open

   Check that the field-installed manual gas valve near the gas inlet is fully open and gas is on at the meter and the heater.

4. 04

   Reset the control

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

5. 05

   Observe ignition

   Watch the unit complete its ignition sequence and run normally without the error returning.

When to call a professional

Gas-pressure diagnostics involve a manometer, the gas train, and the fuel supply, where mistakes risk improper or dangerous operation. The manual instructs that if overheating occurs or the gas supply fails to shut off you should shut the gas at the service valve, not cut pump power. Any work inside the gas train or on live PIM wiring should be performed by a qualified Raypak service technician.