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Troubleshooting a Hot Water Boiler - Gas Fired Boiler Repair

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PROBLEM: Boiler Produces No Heat
Troubleshooting a Hot Water Boiler - Gas Fired Boiler Repair

Electronic Ignition (Intermittent Pilot)

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PROBLEM: Boiler Produces No Heat

Possible Causes

  • Boiler has no power
  • Water level is low
  • Pilot or electronic burner ignition malfunction
  • Thermostat malfunction
Possible Repairs
  • Circuit breaker or fuse controlling the furnace is tripped or blown. Reset tripped circuit breaker. Replace blown fuse.
  • Maintain water level at half full. The boiler's automatic filling system using the pressure relief valve should maintain proper water level by maintaining a 12-15 psi pressure. If you do not have a pressure reducing valve you can also manually feed the boiler by oping up the water feed valve until boiler pressure reaches 12 psi.
  • Natural gas or propane control valve to boiler burner is closed.
  • Pilot light is out. Relight standing pilot.
  • Troubleshoot electronic ignition system if boiler has no standing pilot.
  • Check that thermostat is in heat mode and has appropriate temperature setting.
  • Try moving thermostat setting for temperature up or down a few degrees.
  • Troubleshoot thermostat.

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