is
Instruction manual GWV 85
13.4 Warnings
Warning
Maintenance may only be performed by a qualified service and maintenance engineer.
Note:
(1) As a result of this warning, the appliance will switch to partial load and remain active in that mode until the warning is cleared with RESET and ENTER
(2) As a result of this warning, the controller will insert a delay of 180 seconds between switching off the stage in question and then starting it up again.
Features Cause Measures to take Comment
The display shows the text:
!!! WARNING !!!
WORKING SPEED 2
FAN
NOT CORRECT
(see note 1)
Fan is running at the
wrong speed during
full load.
1. Check running speed 2 of the fan (12.5 "Displaying the
appliance selection")
2. Check whether the flue gas discharge is compliant with the
table.
3. Check that the flue gas outlet is not blocked; remove any
blockage.
If the error cannot be resolved or is persistent, contact your
installation engineer.
To replace the necessary parts, you must contact your
installation engineer.
The display shows the text:
!!! WARNING !!!
TEMPERATURE DIFFERENCE
HEAT EXCHANGER
TOO LARGE
(see note 1)
Defective pump Check that the pump is working correctly To replace the necessary parts, you must contact your
installation engineer.
Blocked or bunged
up pipe system
1. Replace blocked or distorted parts of the pipe system.
2. Clean the pipes to remove any lime accretions or baked-on
dirt.
For repairing and cleaning the pipe system, contact your
installation engineer.
Wrong pump mode Check the pump mode (3.6.4 "System pump") If the error cannot be resolved or is persistent, contact your
installation engineer.
The display shows the text:
!!! WARNING !!!
SHORT
HEATING CYCLES
SAFETY
(see note 2)
The appliance is
oscillating between
full load and partial
load.
1. Change the margin between switching in full load and partial
load by changing the stage difference via "service program |
stage difference"
If the error cannot be resolved or is persistent, contact your
installation engineer.
