Common Faults with Gledhill Accolade A-Class

Common Faults and Troubleshoot Guide for Gledhill Accolade A-Class System

Note: All repair works must be performed by a qualified engineer. Refer to the Gledhill Accolade A-Class manual for detailed instructions.

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  • In areas with hard water (above 200ppm), it's recommended to install an in-line scale reduction device as per Benchmark Guidance Notes.
  • Lowering the stored water temperature can reduce scale formation, but it shouldn't be reduced below 60°C. If the recovery rate is affected, scaling might have occurred. In such cases, follow procedures recommended by a reputable Water Treatment Company.


  • All work should be performed by a suitably qualified/competent person.

No/Reduced Flow of Hot Water at Taps:

  • Ensure the mains water supply is ON.
  • Check the line strainer in the combination inlet valve for blockages.
  • Verify the correct installation of the combination valve to ensure water flows in the right direction.
  • If water at the tap is cold, ensure the boiler is ON and functioning correctly. Check for airlocks in the primary system. Perform the following checks after isolating the unit at the mains electric supplies: i) Control thermostat ii) Overheat thermostat (reset by unscrewing the black cover and pushing the red button) iii) Motorised valve iv) Boiler thermostat v) Boiler overheat thermostat vi) Programmer with the indirect appliance

Emergency Heating and Hot Water:

  • If the boiler cannot supply heat for any reason, heating and/or hot water can be obtained by operating the 'Switch' controls on the front of the appliance.
  • Never bypass any energy cut-out under any circumstances. If the unit is still heating up, isolate the immersion heater from the mains before resetting the energy cut-out.

Discharge from Relief Valves:

  • If cold water is discharging from the expansion relief valve, lower the system pressure and ensure the air pressure in the expansion vessel is 1.5 bar.
  • If the problem persists, and operating the easing control doesn't resolve it, either the Pressure Reducing Valve or the Relief Valve may be faulty. Replace with Gledhill-approved components as necessary.
  • In case of an overheat fault with very hot water discharge, turn off the heat source but not the water supply. Once the system is cool, check and replace faulty components with Gledhill-supplied units before returning to full operation.

By following these steps and referring to the manual, technicians can effectively diagnose and address issues with the Gledhill Accolade A-Class system.