26 Flue system leaks into the air supply
system or re-circulation of flue gases in
concentric flue
Check the air supply and flue system
27
Supply system leaks in
See 26
28
Flow limiter is contaminated
Remove the cold-water connection from the
unit, remove the flow limiter and clean it
29 Heat exchanger is blocked
Remove the heat exchanger from the unit
by releasing the mounting springs (2) and
the clamp at the front. Use pressurised air
to blow the exchanger clean; if necessary,
rinse with a slightly (10%) hydrochloric acid
solution
30
High limit thermostat defective
Replace the maximum thermostat
31 Maximum load is too high
Check the minimum setting of the unit and
the nozzle for a proper diameter.
32
Incorrect nozzle
Replace by correct nozzle
33
Flue gas thermostat defective
Replace
34
Controller defective
Replace entire boiler control box
35
Ignition electrode incorrect
Replace
36 Moisture on gas valve cables
Dry, if necessary using hot air (hair dryer)
and check for proper functioning; replace if
necessary
37
Moisture on electronics box
See 36
38
Moisture in pump wiring
See 36
39
Moisture on fan or and/or connections
Remove the connection and dry by blowing
or using hair dryer
40
Fan connector incorrectly connected
Connector must point in the direction of the
outside of the ventilator and one side must
fit into the slot in the printed circuit
41 Connector incorrectly connected
Check connectors and fit into one another
properly
42
Cable damaged
Check cables for possible damage or kinks
43
Sensor defective
Check cable pipe connections
44 Flue gas re-circulation from behind heat
exchanger
Check heat exchanger seal on flue gas box,
replace if necessary.
EC 16~38 Installation Manual page
53
