Compact Condens : A1003043 - 664Y7200 • A
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35
TROUBLESHOOTING
DHW CIRCUIT
Problem
Probable cause(s)
Solution(s)
6. Boiler does not respond to
DHW heat request
DHW operation OFF
Activate DHW operation through control panel. Refer to “Installer’s menu and parameter descriptions” on page 12.
Faulty storage tank-NTC or thermostat
Check the storage tank-NTC or thermostat and its wiring, refer to “Wiring Diagram and Electrical Connections” on page 18.
7. Insufficient DHW flow
Insufficient water pressure
Check water pressure from the mains
Dirty filters in taps
Clean tap filters
8. DHW temperature too low
Setting of temperature too low
Define DHW preset temperature through control panel. Refer to “Installer’s menu and parameter descriptions” on page 12.
Leakage 3-way valve (towards CH-circuit) Check 3-way valve for leak. Clean or replace as required.
Faulty DHW pump
Check wiring of DHW pump. Replace faulty pump if required.
Input too low due to too much resistance
in air/flue system
Check the absence of obstruction in air/flue system. Clean air filter if any.
Check the burner, refer to “Removal, Check and Installation of the Burner” on page 32
9. Boiler operates only for DHW
Faulty storage tank-NTC or thermostat
Check the storage tank-NTC or thermostat and its wiring, refer to “Wiring Diagram and Electrical Connections” on page 18.
Faulty 3-way valve
Check that 3-way valve is not stuck on the DHW circuit. Replace as required.
ERRORS (HARD AND SOFT LOCKOUTS)
Errors are indicated by a text and an E-code on the display. There are two types of errors :
•
An error with a hard lockout
. This means that it is a final stop and that a manual reset is required to enable normal operation again (eg max temp limit).
•
An error with a soft lockout.
The boiler will automatically resume normal operation after the cause of block is solved (eg gas pressure too low).
After the cause of error has been determined and the error has been solved, the boiler can be put back into operation again.
The cause of error (hard or soft lockout) can be found with the help of the error-list, refer to “Installer’s menu and parameter descriptions” on page 12. A list of all the error codes and the solution(s) to the fault can be found
in the section “Locking Codes” on page 36.
