e- If the connections are correct, disconnect the power of the device from the Circuit Breaker,
disconnect the dead resistor cables from the relay boards and unplug them, and turn on the Circuit
Breaker again and put the device into test mode with K3 and K5. While the device is in test mode,
measure the resistance between the pins you disconnected.
f- If you see the open-circuit ("OL") value between the relay pins, look at the LEDs on the relay board
and check if the lamps are lit.
g- If the lamps are on and "OL" (open-circuit) is still displayed on the screen, replace the relay board.
H- If the trigger cable is properly connected but the LED lamp does not light, plug the trigger cable
into the port of another relay board and recheck the LED lamps.
- If the lamps of new relay board light, the problem will be solved by replacing the relay board.
- If the LEDs of the new relay board do not light, replace the mainboard.
- Put the device in test mode after the part replacements, and check if the resistors are activated.
2.2.3. What to Do in if Comfort Mode Does not Work
When the device is in comfort mode, the water in the exchanger tank is kept at the domestic water
set temperature. When the device is in comfort mode, the water in the tank is heated at minimum
with a single resistor inside the device. Check the relays after you see the tap icon blinking on the
screen of the device in comfort mode. The LED of one of the relays should light up. Measure the
current with a clamp meter through the cables from the contacts of the relay whose LED is lit. If they
are not dead, the comfort mode of the device is operating. If the resistor that needs to heat is dead in
this case, measure this resistor in accordance with the 3rd item of the title 2.2.1.
2.2.4. What to Do if the Device's Circuit Breaker Blows
1- Disconnect the input power supply of the device and observe if there is any physical deformation
in any cable. If there is a deformed cable, replace it.
2- Check if there is a physical deformation such as burning by checking the Circuit Breaker. If the
Circuit Breaker is deformed, replace it.
3- Open the control panel and check if the glass Circuit Breaker of mainboard is intact. If the glass
Circuit Breaker of mainboard is blown and its terminals are open-circuit:
a- Disconnect all the external connections of the connector with the power cable by replacing the
glass Circuit Breaker of the device, and re-energise the device. b- In this case:
- If the glass Circuit Breaker is not lit, measure the resistance between the phase and neutral
terminals of the pump, motorised valve, terminals A1 and A2 of the contactor coil, A1 and A2
terminals of the relays on the board to detect the short-circuited part and replace it. After replacing
and reconnecting the parts, operate the device in DHW and CH heating modes.
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