16
8
Circulation pump does
not activate or it trips
the switch
No power at electrical
connection.
Connectors are loose.
Check and tighten all screws at connection points.
Check and, if necessary, replace the switches, fix
motor connection or installation connection problems.
Faulty capacitor.
Replace capacitor.
Blocked rotor.
Each time you start heating, check whether the rotor
turns easily. Hot water deposits can cause the rotor to
block. Turn the motor axis left and right using a screw
gun until the rotor can move freely.
The pump is blocked
due to deposits.
Dismantle and clean the pump.
9
Thermometer or
pressure gauge does not
display system
temperature or pressure.
Faulty thermometer or
pressure gauge.
Replace thermometer or pressure gauge.
Faulty pump. Large
clearance between the
rotor axis and nut.
Reduce pump speed. Replace pump nuts or the entire
pump.
10
Noise (murmur) coming
from the heating system.
Pump speed is too high.
Lower the speed.
Air in the system.
Bleed the air from the heating system.
Loose knobs or screws
on the stove.
Tighten the knobs and screws.
11
Noise inside the pump.
Too low pressure at
suction part of the
pump.
Increase system pressure or check expansion vessel.
Power outage.
Do not touch anything. When the system has cooled
down, the thermo valve will close itself.
12
Cooling thermo fuse
(thermo valve) is
activated due to water
temperature rise over
95
°
C caused by:
open ash pan door and
no controlled
combustion
Close the ash pan door and reduce system water
temperature using the knob on the ash pan door and
thermostat.
grate in down position
and not many radiators
are open
Switch the grate to up position or open more radiators.
Keep ash pan door closed.
13
Water condensation in
the boiler.
Fuel is wet.
Replace fuel.
Return water
temperature is too low.
Install mixer valve or turn a radiator off.