2.2. Solutions for Functional Faults of Device
2.2.1. In case the heater circuit of the device underheats or does not heat at all:
1- Put the device into test mode by pressing and holding K3 and K5 together for 5 seconds. When
the device is put into test mode, "FT" will be displayed on the screen. In this case, measure the
current through the resistor neutral cables using a clamp meter and detect whether there is a dead
resistor.
2-If there is no dead resistor in test mode, there is no need to control power circuit elements such as
the mainboard, relay boards, resistors and contactors. In this case, the control sensors and hydraulic
equipment must be checked.
a- First, check the piping connections and make sure that the central heating valves outside the
boiler are turned on. If the valves are turned on, remove the motorised valve from the device and
make sure its pin is pressed. While the pin of the motorised valve is pressed, it sends water to the
heater circuit. b- If the motorised valve is in its normal position, check that the heater installation is
not blocked. c- If there is no blockage in the plumbing, check the temperatures of "i00 central heating
supply water" and "i01 central heating return water" from the information menu and observe if there
is an incorrect measurement. If there is an incorrect measurement, relocate the NTCs and check if
the supply or return water temperature measurement has improved. If it does, replace the NTC that
has problem in measurement. If not, remove the NTC and measure the resistance and check
whether the measurement is according to the table. If the measurement is correct, a mainboard
replacement may be required.
3- If there is a dead resistor or a dead cable in test mode, follow the steps below:
a- Check whether there is voltage at the output contacts no. 2, 4 and 6 of the contactor with the
voltage tester by opening the switch cover. Replace the contactor if there is no voltage in any of the
three contacts although the input poles of the contactor are energised and the measured voltage
difference between the terminals A1-A2 of the contactor is 180-240 VAC.
b- Disconnect the input power supply of the device and check whether there is deformation or loose
contact in the phase and neutral cables of the dead resistor.
c- If there is no deformation in the cables, measure between the phase terminals of the resistors and
the neutral busbar after disconnecting the input power supply of the device and make sure that all
the resistors are in the correct resistance range. The required resistance value range is as follows:
Part Code
Part Code
7006250005
7006250004
Maximum
overheat
Minimum
overheat
Maximum
overheat
Minimum
overheat
19
16
28
24
17