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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.
Check cold water mains is on.
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 4.9b)
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. Check parameter settings
correct (Sect 5.1)
Heating system water
discharging from 3 bar safety
valve
Excessive heating system pressure.
Check filling loop has not been left
connected and is not “letting water
pass”.
Disconnect filling loop hose.
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.
Check group combination inlet valve
is fitted. Install if not fitted.
Check incoming mains pressure to
boiler is below 3 bar.
Check expansion vessel is charged
to correct level 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.
Summary of Contents for MATTIRA MAC15B
Page 36: ...36 14 WIRING DIAGRAMS ...
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