EP E
series
11-03
14
Illustrations may differ from the actual product
Allowing for printing errors and errors on proofs
Troubleshooting
Any work requiring the use of tools must be carried out by an authorised electrical installer.
Start all troubleshooting by looking at the status indicator, see point 6 on page 8.
This section does not cover issues relating to the status indicator.
Problem
Possible cause
Solution
Power light off.
No power to boiler.
Check the main fuses.
Main and/or control switch off.
Set the switches to the on position. The delayed reconnection function will
block the boiler if it has been without power for more than 3 minutes.
Control fuse tripped.
Check where the short circuit is, correct the fault and reset the fuse.
Power light on, no heat.
Fault in electronic control system Replace the PCB
Group fuse tripped.
Immersion heater faulty.
Turn off the control switch, the isolating switch and the control fuse, then check
the insulation of the immersion heaters. To change immersion heaters, remove
the lower front panel and the insulation. Disconnect the electrical connections
and then unscrew the faulty immersion heaters. You can order a box spanner
from Värmebaronen for removing immersion heaters. After installing the new
immersion heaters, check that the cables are not touching the immersion heat-
ers or the connections.
The boiler power is not
connected even though
the boiler temperature is
lower than the thermostat
setting.
The number of stages has been
limited.
Check the setting, see page 8 "Number of power stages".
The boilers is being controlled by
a 0-10 V signal.
The boiler temperature setting is too low.
Outdoor temperature compensa-
tion is connected – the normal
thermostat does not control the
boiler temperature.
Check the settings on the UTK E
Faulty temperature sensor.
Check the temperature sensor.
The sensor must not be connected to the circuit board during the resistance
measurement.
With the boiler switched on measure the voltage at the terminals on the termi-
nal block to which the sensor is connected.
°C
Ω
V
°C
Ω
V
°C
Ω
V
10
19 899 2,89
40
5 326 2,36
70
1 752 1,57
15
15 711 2,83
45
4 368 2,24
75
1 479 1,44
20
12 492 2,76
50
3 602 2,11
80
1 255 1,31
25
10 000 2,67
55
2 986 1,98
85
1 070 1,19
30
8 057 2,58
60
2 488 1,84
90
915 1,08
35
6 531 2,48
65
2 083 1,70
95
787 0,97
The electric boiler oper-
ates erratically, moving
up a couple of stages be-
fore immediately moving
down again, etc.
The flow of water through the
electric boiler is too low.
Check that the circulation pumps and valves are operational.
An easy way of getting an idea of the water flow through the boiler:
1.
Limit the boiler stages to make the power constant – for example to four
power stages.
2.
Allow the boiler temperature to stabilise.
3.
Measure the temperature increase between the boiler return and supply
pipes.
4.
Calculate the flow through the boiler using this formula.
5.
Use the data on page 4 to check if the flow is adequate.
q = P / (
∆
t x 1.16)
q = water flow in m
3
/h. ( m
3
/h x 1000/3600 = litres/second)
P = rated power of boiler in kW
∆
t = temperature difference between the boiler return pipe and supply pipe
in
o
C.
1.16 = heat absorption capacity of the water.
