Intergas Compact Hre 24 fault 5: Intergas Compact HRE 24/18 goes into fault code 5, burner issue

1. 1. Verify gas supply to the property and appliance.

   Why: Insufficient gas supply will prevent proper ignition and stable flame detection.

   How: Check the main gas meter isolation valve is open and the appliance's gas isolation valve is open. Perform a gas tightness test on the appliance and pipework.

2. 2. Inspect the condensate drain and siphon for blockages.

   Why: A blocked condensate system can interfere with proper combustion and flue gas evacuation, leading to flame issues.

   How: Visually inspect the condensate trap and pipework for any obstructions. Clean the siphon and drain if necessary, ensuring a clear path for condensate removal.

3. 3. Examine the flue system for obstructions or recirculation.

   Why: Restricted airflow or flue gas recirculation can starve the burner of oxygen or introduce combustion products, causing an unstable flame.

   How: Visually check the flue terminal outside for any blockages (e.g., bird's nest, debris). Internally, inspect the flue for any disconnections or obstructions.

4. 4. Test the gas working pressure at the appliance.

   Why: Low or unstable gas pressure can lead to a weak or intermittent flame signal.

   How: Connect a manometer to the test point on the gas valve and record the running pressure during ignition and operation. Compare readings to manufacturer's specifications.

5. 5. Inspect and clean/replace the ionisation electrode and ignition lead.

   Why: A dirty, corroded, or faulty ionisation electrode will struggle to detect the flame, resulting in a weak signal.

   How: Isolate the electrical supply. Remove and visually inspect the ionisation electrode for carbon build-up or damage. Clean with a fine abrasive pad if necessary, or replace if damaged. Check the ignition lead for cracks or poor connections.

6. 6. Check the earthing (grounding) of the electrical supply.

   Why: A poor earth connection can affect the flame detection circuit's ability to accurately sense the flame.

   How: Isolate the electrical supply. Use a multimeter to verify good earth continuity to the boiler chassis and relevant components.

7. 7. Assess the condition of the burner.

   Why: A dirty or damaged burner can lead to incomplete combustion and an unstable flame.

   How: Isolate the electrical supply and gas supply. Remove the burner and inspect for blockages, damage, or signs of wear. Clean or replace as required, following manufacturer guidelines.

8. 8. Verify correct gas valve adjustment and operation.

   Why: An incorrectly adjusted or faulty gas valve may not supply the correct gas/air mixture for stable combustion.

   How: With the boiler running, check the gas valve's modulation and ensure it's operating smoothly. If adjustable, verify settings against manufacturer's instructions using a flue gas analyser.

Commonly failed parts

• Ionisation electrode
• Ignition lead
• Condensate siphon/trap (if blocked beyond cleaning)
• Gas valve (if deemed faulty after testing)
• Burner gasket/seals (if burner removed for inspection/cleaning)

Sources

The AI cross-checked the following manufacturer and trade sources while producing this checklist.

• hritechniek.nl
• intergas-verwarming.nl
• intergasboilersguide.co.uk
• boilercentral.com