2.2.2. In case the device underheats or does not heat domestic water at all:
1- Put the device into test mode by pressing and holding K3 and K5 together for 6 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, remove the motorised valve on the device and check whether the pin goes in when the flow
passes through the device. If the pin is going in, check the spring suppressed by the motorised valve
in the supply manifold. If the spring is faulty and cannot be repaired, replace the supply manifold,
b- If the pin is not going in:
- If the flow rate appears to be at its normal value, follow the steps described in the title 4.9 "Voltage
and Position Control in Domestic Water Heating". If voltage values are normal, replace motorised
valve.
- If the voltage value is not as it should be in the domestic water position, read the "i05 Domestic
water flow rate (L/min.)" information from the information menu. If the flow rate is displayed as "0"
even though water is passing through the domestic water circuit, make sure that the flow sensor is
installed correctly. If a value of "0" or less is displayed even though the flow sensor is installed,
replace the flow sensor.
c- If the pin of the motorised valve completes the action normally, make sure that the submersion
type NTC on the hydroblock is installed correctly. If the NTC is installed properly, check the "i02
domestic water instantaneous temperature" value in the information menu. If the value is incorrect,
replace the NTC.
3- If there is a dead resistor
or a dead cable
in the test mode
, follow the steps below (you can see
the images related to the measurements in this section in the 3rd item of the title 2.2.1).
a- Check whether there is voltage at the output contacts no. 2, 4 and 6 of the contactor with the
voltage tester. 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
Limit
Minimum
Limit
Maximum
Limit
Minimum
Limit
19
16
28
24
d- If there is no loose contact in the cables and the resistance of the resistors are within normal
values, take measurements from other resistors in the same group. If all the resistors in a single
resistor group are dead, check that the relay trigger cables are undamaged and connected to both
the mainboard and relay board sides. On the mainboard, these cables should be connected to the
following ports:
- For 6 and 9 kW devices: "Relay Group 1"
- For 12 and 15 kW devices: "Relay Group 1" and "Relay Group 2",
-For 18, 24 and 27 kW devices: "Relay Group 1", "Relay Group 2" and "Relay Group 3".
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