3
Failures / Errors
GB012 - 25K
9
3.3 Failure codes and corrections steps
4C is flashing.
Overheat lock-out by temperatur limiters (2 x STB : Flue gas + prim. Heatexchanger). In this case ; Heat
demands is blocked and pump stops 3 minutes later.
Control Step Action
1. Is the system pressure between 1 - 2
bar?
yes: -->2.
no: B Fill water in sysytem.
B Bleed the system
1)
.
B Press RESET button and restart again.
4C failure still exist? -->2.
2. Is the circulation pump blocked ? yes: B Eliminate the blockage (turn the shaft).
If not succesful :
B Switch off the appliance.
B Cut mains supply.
B Drain the water from appliance.
B Change the pump.
B Fill with water and bleed the system again.
B Connect to main supply.
B Switch on the appliance.
B Press RESET button and restart again.
4C failure still exist? -->3.
no: -->3.
3. Check the flue gas pipe line.
Is there any blockage ?
yes: B Check the flue gas pipe and remove the block-
age.
B Switch on the appliance.
B Cihazý resetleyip yeniden çalýþtýrýn.
4C failure still exist? -->4.
no: -->4.
4. Check the recuperator.
Is there any blockage?
yes: B Clean the recuperator. Replace if necessary.
B Switch on the appliance.
B Press RESET button and restart again.
4C failure still exist? -->5.
no: -->5.
5. B Switch off the appliance.
B Check the temperature limiter
(STB) on recuperator.
Ist the circuit open or wrong
installed ?
no: -->6.
yes: B Change the temperature limiter (STB) or correct
the installation.
B Switch on the appliance.
-->6.
To Next Page
