Pitco 4 Flashes Error Code
Ignition module orange LED — Main Valve Circuit Fault: problem in the main burner valve circuit.
Source: PITCO/pitco_controller_error_codes.txt
What does Pitco 4 Flashes mean?
Four orange flashes on the Pitco ignition module indicate a Main Valve Circuit Fault — a problem in the main burner valve (MV) circuit. A failed heat relay (K1) on the relay board, a main valve coil issue, or a wiring fault stops the module from energizing the main burner. Diagnosis confirms the relay board's H.D. LED is lit and that 24VAC reaches the MV terminals during a heat call.
Symptoms
- Orange LED flashes four times, pauses, and repeats.
- Main burner does not light even with the pilot proven.
- H.D. LED on the relay board may not be lit during a heat call.
- Missing 24VAC at the MV terminals on the gas valve under heat demand.
Common causes
- Heat relay (K1) on the relay board has failed.
- Main valve (MV) coil is open or defective.
- Wiring fault in the main valve circuit.
- Loose connection at the MV terminals on the gas valve.
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Diagnostic steps
Verify the H.D. LED on the relay board
Confirm the H.D. (heat demand) LED on the relay board lights during a heat call. If it does not, the heat relay K1 or its drive is suspect.
Measure 24VAC at the MV terminals
During a heat call, measure for 24VAC at the MV terminals on the gas valve. Absent voltage points to the relay or wiring; present voltage with no main flame points to the valve.
Check the main valve coil
Measure the MV coil for an open or out-of-spec reading. A failed coil prevents the main burner from opening and must be replaced.
Inspect the K1 relay and MV wiring
Examine the K1 heat relay on the relay board and trace the main valve wiring for breaks or loose terminals that open the circuit.
When to call a professional
Call a Pitco-authorized technician if 4 Flashes persists after verifying the H.D. LED and 24VAC at the MV terminals. Relay board K1 replacement and gas valve diagnosis require a technician trained on the relay board and gas system to work safely, confirm the main valve energizes, and restore the heat circuit to specification.
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