Boiler locks out with 'Low Gas Pressure', 'Gas Supply', or similar message; may have intermittent ignition failures.

Safety first: Do not attempt to adjust gas regulators or valves yourself. Gas work must be done by licensed personnel.

• 1. Check other gas appliances: See if stoves, dryers, or other gas equipment operate normally. If all are affected, contact your gas utility.
• 2. Observe timing: Note if the error occurs when multiple gas appliances run simultaneously. This can indicate undersized piping.
• 3. Inspect visible piping: Look for obvious damage, corrosion, or recently closed shutoff valves near the boiler.
• 4. Do not bypass safety: Never jumper or bypass gas pressure switches or controls.

A qualified technician must measure inlet and manifold gas pressures with a manometer and correct any piping or regulator issues.