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MINI ULTRA ELECTRIC BOILERS Installation and operating manual (Revision: May 2015)
20
Section 7 : TROUBLESHOOTING
PROBLEM CAUSES SOLUTION
The display shows
---
in “TARGET TEMP”
-There is no heating demand
-When the outdoor sensor
is used and the icon is shown, the
outside temperature is above the
boiler shut down setting.
-The switch located on the back of the
controller is set to “Bi-Energ” and the
icon is shown.
-Generate a heat demand
-Temporarily increase the value of this setting
on the controller configuration.
-Set the switch to “Elect”
The display shows
“Er1”
and the icon
is displayed.
The controller is not detecting the
presence of the outdoor sensor.
-Make sure that the sensor cable connected to
the unit is not in short or open circuit. Do not
install a jumper between S1-S1 when the
sensor is not required.
-Check the resistance value (ohms) of the
sensor. It should correspond to the value
shown on the table below otherwise it should
be replaced.
Check for proper connection of the wires
inside the boiler connected to S1S1 and at the
controller terminals.
The display shows
“
Er2
” and blinks
The controller is not detecting the
presence of the boiler temperature
sensor.
-Check the state of the sensor located in the
immersion well located at the top of the
electrical element compartment.
-Check the resistance value (ohms) of the
sensor. It should correspond to the value
shown on the table below otherwise it should
be replaced.
Stage 2 is ON but not
Stage 1
There is no problem. A rotation of the
stages is provided to allow an equal
time of operation of the stages.
The boiler target
temperature does not
change when the
outdoor temperature
varies.
The outdoor sensor has not been
detected when the power has been
applied to the unit.
Check the connection of the outdoor sensor to
terminals S1S1. Turn OFF the power to the
unit for 5 sec. and set it back ON.
The boiler water
temperature at the
outlet of the unit
“BOILER T
0
”does not
get to the “BOILER
TARGET T
0”
-The room thermostat is not in
constant demand.
-Some heating elements are defective
-The total capacity of the boiler is
being used by the heating distribution
system at this temperature.
-Adjust the thermostat anticipator (If available)
to obtain longer operating cycles
-Replace defective elements
-If a higher boiler water temperature is
required to satisfy the heat demands of the
thermostats, a boiler having a larger capacity
is required.
Boiler stays in demand
even when the
thermostat is not in
demand.
(Systems with more
than one thermostat)
-On systems with electric zone
valves, one or many end switches
included in the valve is defective.
-A jumper has been installed on
terminals W&R of the boiler.
-Change defective end switch.
-Make appropriate connections as shown in
fig.6
An overheated plastic
odour is released from
the boiler
Turn the power OFF to the boiler.
Open the front and left side panel of
the boiler. Check the components and
electric wires for indications of
overheating.
Replace overheated components and check
supply voltage to the boiler.
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