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8. Troubleshooting
Error
Description
code
5x Flame loss
é:36
Communication error
é:37
with the SU PCB
Communication error
é:38
with the SCU PCB
Shutdown input in
é:39
locked-out mode
HRU/URC unit test
é:40
error
8.2 Shutdowns and lock-outs
8.2.1. Blockage
If the blocking conditions still exist after several start
up attempts, the boiler will switch into locking mode
(fault). The boiler can only start operating again once
the causes of the lock-out have been rectified
and after pressing the
8.2.2. Lock-out
A (temporary) blocking mode is a boiler operating
function caused by an unusual situation. In this case,
the display gives a code of blocking (code 5t[:9).
The boiler control will try to re-start several times.
The boiler will start up again after the blocking
conditions have been eliminated. The shutdown codes
can be read out as follows:
1. Press the two
buttons simultaneously.
2. Confirm by pressing ® button. 5t is displayed,
alternating with the shutdown code 9.
3. Press the [+] button. 5 appears on the display.
i
The boiler starts up again automatically when
the reason for the blocking has been removed.
MCA-Pro ISM Rv.4.1 2/2017
Probable causes
• No ionization current
• Bad connection
• Bad connection
• Defective SCU PCB
• Bad connection
• External cause
• Parameter incorrectly
set
• Bad connection
• External cause
• Parameter incorrectly
set
button.
MCA Pro 45/65/90/115
Checking / solution
• Purge the gas supply to remove air
• Check that the gas valve is fully opened
• Check the supply pressure
• Check the operation and setting of the gas valve unit
• Check that the air inlet and flue gas discharge flues
are not blocked
• Check that there is no recirculation of flue gases
• Check whether the SU PCB has been correctly fitted
in the connector on PCU PCB
• Check the wiring
• Replace SCU PCB
• Check the wiring
• Suppress the external cause
• Check the parameters
• Check the wiring
• Suppress the external cause
• Check the parameters
99
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