7 | P a g e
4. Ensure all air is vented out of the boiler and system.
5. On combi’s, the diverter valve operation may be faulty, check as follows:
• Safely isolate boiler from electrics.
• Remove the motor from the three-way valve and see if the cartridge moves up and down.
• If this doesn't move smoothly and seems to be sticking, replace the cartridge.
6. Check system pipework configuration correct.
7. Ensure all valves on the system and boiler are open.
8. Ensure all air is vented out of the boiler and system.
9. Check system pipework and filters for any blockages or restrictions.
10. Check all installation components are functioning correctly (mixing pumps and 2-way valves, etc.).
11. In the case of a combi, check the plate heat exchanger is not blocked.
12. Check for Voltage at the pump. You can force the pump:
• By removing PWM cable to allow 230v cable to power pump at full speed.
• If pump does not run via above tests check pins on pump not bent – straighten to fix and check
continuity across wiring harness. If all ok and no voltage going to pump, then PCB fault.
• If voltage to pump and all other checks are ok, replace pump.
13. If all the above checks are ok, PCB may be at fault.
*Note * If plastic pipes are used, they must be barrier pipes & UFH must comply with DIN4726-4729. If this is not the
case, system separation must be provided as these pipes are porous & will allow air into the system.
111 Description: Maximum temperature exceeded.
Cause: Possible sensor fault or circulation.
1. Check the system for an external heat source such as solar which may affect the return temperature.
2. Confirm flow and return temperatures using the A menu, A0 &A1.
3. Check T1 and T2 resistances in line with temperatures from flow and return temperatures found on page 67.
• Take resistances at the connector X4 on the PCB pins 1 & 2, and pins 3 & 4. This checks the wiring
harness continuity and connectors at same time.
• Check wiring connectors are not loose or corroded.
• Disconnect the connector from PCB to ensure no additional resistances are given through the PCB.
• If readings incorrect, take resistance reading direct from sensor & replace sensor or wiring harness
as required.
*Note sensors may need cleaning and not always replaced*.
4. Ensure all air is vented out of the boiler and system.
5. On combi’s, the diverter valve operation may be faulty, check as follows:
• Safely isolate boiler from electrics.
• Remove the motor from the three-way valve and see if the cartridge moves up and down.
• If this doesn't move smoothly and seems to be sticking, replace the cartridge.
6. Check system pipework configuration correct.
7. Ensure all valves on the system and boiler are open.
8. Ensure all air is vented out of the boiler and system.
9. Check system pipework and filters for any blockages or restrictions.
10. Check all installation components are functioning correctly (mixing pumps and 2-way valves, etc.).
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