16
The control buttons of the boiler will be locked and no button will
respond when pressed. Internally all the settings remain the same and the
boiler will function normally.
To unlock the buttons, press the same button down for a few seconds until the above displayed symbol goes off. If
the boiler is disconnected from the mains or there is a failure in the house’s electricity supply, the buttons will also
be unlocked.
6.11 PUMP ANTI-SEIZE FUNCTION
The advanced boiler control will automatically energize the pump for 10 seconds each month to protect it from
seizing during long periods of inactivity. The power supply must be maintained for this function to operate.
7 TROUBLESHOOTING
7.1 POSSIBLE FAULTS & SOLUTIONS
Problem Possible
cause
Solution
Boiler will not start
No power to boiler.
Check incoming power supply.
No power.
Check boiler control switch is on. (See
Section 6.1.)
Heating overheat. Switch tripped.
Locate switch and reset. (See Section 7.2)
DHW Overheat switch tripped.
Locate switch and reset. (See Section 7.2)
DHW tank empty.
Open a hot water tap until the water
flows.
Fault E1 displayed
Heating flow temperature sensor
Heating water out temperature
probe defective.
Contact Technical Service
Fault E2 displayed
Heating return temperature sensor
Heating water return
temperature probe defective.
Contact Technical Service
Fault E3 displayed
Heating system water flow switch
Low heating system pressure.
Check for leaks.
Refill heating system to 1.5 bar.
Pump not turning.
Check rotating freely (sect 5.5)
Replace pump if necessary.
Air in system.
Purge thoroughly.
Check automatic air valve open.
Vent pump (sect 5.5)
System resistance too high or
blockage.
Check pump speed 3.
Check pump duty (sect 4.9)
Open all radiator valves.
Install system by-pass.
Fault E6 displayed
DHW temperature sensor
Defective DHW tank
temperature sensor.
Check connections.
Replace sensor if necessary.
Fault E8 displayed
Outdoor temperature sensor
Defective outdoor temperature
sensor or not present.
This sensor is optional. Check
connections. Replace sensor if necessary.
Heating system water
discharging from 3 bar safety
valve
Excessive heating system
pressure.
Check filling loop not passing and remove.
Check expansion vessel is charged to
correct level with air.
Check system expansion volume.
Domestic water discharging
from 7 bar valve
Excessive pressure in domestic
water system.
Install a pressure reducing valve when
incoming mains pressure to boiler is up 5
bar.
Check 2L expansion vessel charged with
air.
The buttons do not respond
Control panel blocked
See Section 6.10 BLOCKING THE
CONTROLS
Low heating temperature
Settings too low.
Check temperature & output selected.
Failure of heating elements
Check and replace.
Heat requirements miscalculated.
Re-calculate & configure.
If the suggested action fails to resolve a problem, please contact ELNUR technical service for further advice.
