Plum ecomaxx 800 R2, Assembly And Service Manual

Page: 43 / 48

20 Troubleshooting
Faults Hints
1. The display is blank
despite connection to
power supply.
Check:

if the main fuse is burnt-out, replace if so,

if the lead connecting the panel with the module is properly
plugged in, and if it’s not damaged.
2. Preset CH temperature
on the display is
different than the
programmed one.
Check, if:

HUW container is being filled and preset HUW temperature is set
at the value higher than boiler preset temperature. If YES -
read-out variations will disappear once HUW container has been
pre-heated, or reduce preset value of HUW container.

room thermostat is ON – set the service parameter Red. preset
b. temp. at ,”0”

night time decrease is ON; if YES- switch it off
3. CH pump is inoperative.
Check, whether:

boiler temperature has exceeded the value set in CH pump
activation temperature (MENU
→
boiler pump). If YES- wait or
reduce the value set in this parameter,

room thermostat prevents start of CH pump. If YES - set the
parameter
CH pump standstill time – at ,”0”. See-sec.28

HUW priority to prevent CH pump start is ON. If YES- disable it
by setting
HUW pump mode at No priority. See sec .12

HUW pump is damaged or locked.
4. The fan is inoperative.

If YES, and the boiler temperature is lower than the preset value
by
DelT lack of fuel - it is a normal condition related to detection
of lack of fuel.
5. Fuel feeder inoperative/
fails to feed.

blow-in output is too low - increase it,

check whether connecting terminals 1-2 of STB safety
temperature limiter are bridged (jumper should be provided only
in case temperature limiter is not connected).

if the boiler is equipped with STB temperature limiter with
manual return to home position - release the limiter. To do this,
remove the lid and press push-button acc. documentation
provided by boiler manufacturer,

check the setting of " Fuel Feeder and Blow-In and set at ON in
MENU
→
Boiler Settings ,

check the fan and replace, if necessary,
6. When the Individual
Fuzzy Logic mode is on,
the
fuel is not
completely burned,
there are unburned
particles of fuel in the
ash.

check whether feeder wires are correctly connected to the
terminals,

if STB temperature limiter is connected to terminals 1-2 - check
whether power supply has not been cut off due to boiler
overheating,

check whether feeder motor is not faulty,

check the setting of " Fuel Feeder and Blow-In and set at ON in
MENU
→
Boiler Settings ,

in case motor is running and fuel is not supplied - replace cotter
pin in coupling of fuel feeder acc. boiler manual.