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BTH ULTRA Electric Boilers Installation & Operation manual (Revision: June 2015) 24.
Section 7- TROUBLE SHOOTING
7.1 TROUBLE SHOOTING TABLE
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 elect. 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
When stage 3 or 4 comes ON,
stage 1 or 2 comes OFF
This sequence is normal on
boilers from 27 to 33kW since
stage 2 and 3 activate two
elements. Stage 1 or 2 is
disactivated to obtain an equal
increase of capacity of the boiler.
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 controller shows that the
heating stages are ON but the
heating elements do not heat.
The main contactor inside the
unit is not activated. There is no
24Vac at his coil.
The contact of the hi limit temp.
control (automatic reset or manual
reset in some models) is open. Reset
the control and check for proper
operation.
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
-Adjust the thermostat anticipator (If
available) to obtain longer operating
cycles
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