61 | P a g e
7P1 Description Pump error: low flow rate.
Cause: This is not visible on the display screen and is only shown in the Faults section of the technical area with
Pump Active is normally displayed on the screen. The flow control technology and pump feedback has detected
insufficient flow around the system.
1. Check pipe system resistance allows minimum flow rates of 370l/h for boilers with the iCon1 heat
exchangers and 400l/ for boilers with the iCon2 heat exchangers. This can be checked via the customer
information menu.
2. Check system pipework configuration is correct.
3. Ensure all valves on the system and boiler are open.
4. Ensure all air is vented out of the boiler and system.
5. Check system pipework and filters for any blockages or restrictions.
6. Check the pump speed is correct via parameters 2.4.5 & 2.4.6, adjust if required.
7. Diverter valve operation may be faulty, check as follows:
a. Safely isolate boiler from electrics.
b. Drain the boiler.
c. Remove the motor from the three-way valve and see if the cartridge moves up and down.
d. If this doesn't move smoothly and seems to be sticking, replace the cartridge.
*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.
701 to 706 Description Zone Flow temperature sensor fault.
Cause: The flow sensor on the specified zone is faulty. The individual zones faults are identified as 701 for zone 1,
702 for zone 2, and so on up to zone 6, 706.
1. Check the continuity of the sensor and replace the sensor if necessary.
2. Check the condition of the connections and wiring from the sensor concerned to the PCB. Use a multimeter
to confirm continuity through the cables. Replace cables as required.
3. If the cables and the sensor are ok, replace zone manager.
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