19
Intergas Safety Circuit Open (Limit Switch / Safety Chain Fault)

Code 19 displayed, boiler fails to start, may be related to safety chain

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Open overheat thermostat, Tripped safety limit, Loose wiring in safety loop, Faulty safety device

How to Fix / Troubleshooting

Safety first: Do not bypass any safety devices. Investigate and correct the cause of the trip.

Technician steps:

  • Identify safety chain: Refer to the Intergas wiring diagram to locate all devices in the safety loop (overheat stats, flue stats, etc.).
  • Check continuity: With power off, test continuity through each safety device. Reset any manual-reset devices if the underlying cause has been addressed.
  • Inspect wiring: Look for loose or broken wires in the safety circuit.

Replace any faulty safety devices with OEM parts. If the safety chain is intact but code 19 remains, the PCB input may be defective.

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Repair Difficulty

Hard 4/5

Required Part

Overheat thermostat
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