ALUTHERM
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Boilers 52
ALUTERM B 350 - 600
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Installation, User and Service Manual
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instructions for user
Heating
Alutherm B 350 - 600
E 31
Supply Sensor Open
An open circuit has been detected in the
boiler supply temperature sensor circuit.
1. Check supply temperature sensor, connectors and wiring
harness for an open circuit.
2. If necessary replace the sensor, or the wire harness.
3. After fi xing the problem reset the appliance and resume
normal operation.
E 32
DHW Sensor Shorted
A short circuit has been detected in the
DHW temperature sensor circuit.
1. Check DHW temperature sensor and wiring harness for a
short circuit.
2. If necessary replace the sensor, or the wire harness.
3. After fi xing the problem reset the appliance and resume
normal operation.
E 33
DHW Sensor Open
An open circuit has been detected in the
DHW temperature sensor circuit.
1. Check DHW temperature sensor, connectors and wiring
harness for an open circuit.
2. If necessary replace the sensor, or the wire harness.
3. After fi xing the problem reset the appliance and resume
normal operation.
E 34
Low Voltage
Line voltage has fallen below an
acceptable operating level.
The boiler will automatically reset once line voltage returns to
normal.
E 37
Low Water
Water level has fallen below 0.7 bar.
1. Increase pressure to normal range.
2. The boiler will automatically reset once water level returns to
normal.
E 43
Return Sensor Shorted A short circuit has been detected in the
boiler return temperature sensor circuit.
1. Check return temperature sensor and wiring harness for a
short circuit.
2. If necessary replace the sensor, or the wire harness.
3. After fi xing the problem, reset the appliance and resume
normal operation.
E 44
Return Sensor Open
An open circuit has been detected in the
boiler return temperature sensor circuit.
1. Check return temperature sensor, connectors and wiring
harness for an open circuit.
2. If necessary replace the sensor, or the wire harness.
3. After fi xing the problem, reset the appliance and resume
normal operation.
E 45
Flue Sensor Shorted
A short circuit has been detected in the
boiler fl ue temperature sensor circuit.
1. Check fl ue temperature sensor and wiring harness for a short
circuit.
2. If necessary replace the sensor, or the wire harness.
3. After fi xing the problem reset the appliance and resume
normal operation.
E 46
Flue Sensor Open
An open circuit has been detected in the
boiler fl ue temperature sensor circuit.
1. Check fl ue temperature sensor, connectors and wiring
harness for an open circuit.
2. If necessary replace the sensor, or the wire harness.
3. After fi xing the problem reset the appliance and resume
normal operation.
E 47
Water pressure sensor
error
Water pressure sensor is disconnected or
broken
1. Check water pressure sensor, connectors and wiring harness.
2. If necessary replace the sensor, or the wire harness.
3. After fi xing the problem reset the appliance and resume
normal operation.
E 76
External Limit Open
An external automatic reset boiler limit
has opened.
1. Correct condition which caused limit to open.
2. Boiler will automatically reset once external limit closes.
E 77
Siphon error
Siphon switch open
Check the air intake and the fl ue outlet for any obstructions.
The pressure over the appliance is too high. Delta P < 8.3 mbar.
E 80
Return > Supply
Return temperature is higher than supply
temperature.
Confi rm water fl ows in boiler return and out boiler supply.
E 81
Sensor Drift
Supply and return temperatures are not
equal.
1. Check water is fl owing through boiler.
2. Wait a few minutes for the water to equalise the temperature,
the boiler will automatically reset once temperatures become
equal.
3. If boiler doesn’t reset, check the NTC’s and check the wire
harness, replace if necessary.
E 87
Overtemp lockout
An external boiler limit has opened.
1. Correct condition which caused limit to open, then reset
boiler.
2. The boiler needs to be reset once external limit closes.
Errors (hard and soft lockouts)
Hard
Lockout
Code
Description
Cause of the fault
checking and fi nding a solution for the fault
