Installation manual

installation manual TWIN 80 EN
(E000129016 - installation manual TWIN 80 EN - 030106v07
31
4.2.2. Status indication during “blocking action”
What is a blocking action?
The regulation blocks the burner till conditions are within certain requirements.
During blocking operation, the display status shows a continuous indication. Each blocking action will stay during the 3 minutes anti-
cycling time.
Most blocking actions restore automatically. However, some need to be repaired or can be restored by interrupting the supply power.
Status
code
description action repair
U
continuous
supply Line and
Neutral reversed
- Line and Neutral are exchanged
- no good Earth present
- reverse Line / Neutral
- check wiring
1
continuous
flow sensor open
circuit
broken flow sensor, or wiring interrupted, or wiring not
correctly connected.
- replace flow sensor
- check wiring
1.
continuous
flow sensor short
circuit
faulty flow sensor, or wiring interrupted, or wiring not
correctly connected
- replace flow sensor
- check wiring
2
continuous
return sensor open
circuit
broken return sensor, or wiring interrupted, or wiring not
correctly connected
- replace return sensor
- check wiring
2.
continuous
return sensor short
circuit
faulty return sensor, or wiring short circuit or contact to
earth
- replace return sensor
- check wiring
4
continuous
flue gas sensor open
circuit
boiler will work without having a flue gas sensor as well,
unplug the sensor, and interrupt the supply power
- replace flue gas sensor
- check wiring
A
continuous
blocked burner caused
by high flue gas
temperature (>100°C)
If the flue gas sensor exceeds a temperature of 100°C,
the burner is blocked
burner action restores
automatically when the actual flue
gas temperature descends 80°C
- check flue gas sensor
- check the water flow
- check primary heat exchanger
H
continuous
blocked burner caused
by high flow
temperature (>105°C),
while the burner was
off
If the flow sensor exceeds a temperature of 105°C, while
the burner is off, the burner is blocked
burner action restores
automatically when the actual flow
temperature becomes 5°C below
the set point
P
continuous
pump test at each
burner start
(pump test repeats
each 15 seconds)
- at each burner start the boiler is doing a pump test
program. The boiler is starting and stopping the pump and
measuring the actual pressure sensor water pressures
- the burner does not start when the difference between
the active pump pressure and the static pressure is less
than 0.05 bar or more than 0.54 bar (0.64)
pump test ends when a test
pressure difference is obtained
between 0.05 and 0.54 bar (0.64
bar for boiler type 40)
- no water flow (system water flow
may be blocked by thermostatic
valves or zone regulation)
- check pressure sensor
- check pump