23
Värmebaronen EP 26E and EP 42E
Troubleshooting
Intervention that requires tools must be performed by a qualified electrician!
Start troubleshooting by looking at the status indicator, see "menu Management".
Fault
Possible cause of fault
Action
Indicators and
display off.
Electric boiler has no power. Check the main fuses.
Main and/or control switch off. Set switch to position. Activation delay locks the boiler if it has had
no power.
Control fuse triggered.
Check where the short circuit is, take remedial action and then reset
the fuse.
Malfunction of the control
electronics
Change the circuit board
Group fuse is triggered.
Immersion heater faulty.
Check the insulation of the immersion heaters, which are accessible
when the boiler's lower front plate and insulation are removed.
Replace defective immersion heater. When the new immersion heater
is in place, check that the power cables are not against the electrical
connections.
The boiler does not step
up power even though
the temperature in the
boiler is lower than the
set value.
The boiler stages have been
limited.
Check the "Number of output stages" setting.
The boiler is controlled by
external signal.
Check the voltage of the signal.
Outside temperature
compensator connected.
Check the settings for the UTK function.
The temperature sensor
is defective.
Take control measurements of the temperature sensor.
The sensor must not be connected to the circuit board during
resistance measurement. When the boiler is energized, voltage is
measured in the sensor’s connection points at the PCB.
Boiler temperature sensor
°C
k
Ω
V
°C
k
Ω
V
°C
k
Ω
V
5
141.9
4.7
40
30
3.7
75
8.2
2.3
10
111.6
4.6
45
24.6
3.6
80
6.9
2
15
88.3
4.5
50
20.2
3.3
85
5.8
1.8
20
70.3
4.4
55
16.7
3.1
90
5
1.7
25
56.3
4.2
60
13.9
2.9
95
4.2
1.5
30
45.4
4.1
65
11.6
2.7
100
3.7
1.3
35
36.8
3.9
70
9.7
2.5
Outdoor temperature sensor,
Option
°C
k
Ω
V
°C
k
Ω
V
-40
88.7
4.5
0
8.8
2.3
-35
64.2
4.3
5
6.8
2.0
-30
47.0
4.1
10
5.4
1.7
-25
34.7
3.9
15
4.2
1.5
-20
25.9
3.6
20
3.4
1.3
-15
19.5
3.3
25
2.7
1.1
-10
14.8
3.0
30
2.2
0.9
-5
11.4
2.7
Uneven regulation;
the boiler increases
a few stages and
is then reduced
immediately etc.
Water flow through the electric boiler too low.
Check that circulation pumps and valves are working.
This is an easy way to get an idea of the level of flow through the boiler:
1. Limit the power stages of the boiler so that the power is constant, for example to four power stages.
2. Let the boiler's temperature become stable.
3. Measure the temperature increase between the return and flow lines of the boiler.
4. Calculate the flow through the boiler using the formula below.
5. Check against the flow details whether the flow is adequate.
q = P / (
∆
t x 1.16) Q = water flow in m3/h. (m3/h x 1000/3600 = litre/second)
P = electrical boiler delivered output in kW
∆
t = temperature difference between the boiler's return and flow lines in °C.
1.16 = water's thermal absorption coefficient.
