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3.17 Troubleshooting
Other faults or problems with the appliance that may not trigger an alarm are listed below
No heat supplied to the property or hot water
storage cylinder.
Timer mode not enabled.
Time clocks not set.
No demand signal from remote digital
inputs.
Ensure timer mode is enabled in ‘Timer’ menu.
Ensure time clocks are set correctly in ‘Timer’
menu.
Check feeds from room thermostats, underfloor
manifolds and remote time clocks are
functioning correctly.
Timeclock and controls are switched on, and
appliance is in standby.
Heat demand for the property has been
satisfied
If the property temperature is too low, increase
the flow temperature in the ‘Temperature’ sub-
menu.
The appliance has been producing heat for
some time, but the property heat demand
has still not been satisfied.
Flow temperature set too low.
Airlocks in heating system.
3-port diverting valve fault.
Heating circulating pump fault.
Increase flow temperature in the ‘Temperature’
sub-menu.
Bleed heating system to remove airlocks.
Ensure valve is operating correctly.
Ensure pump is operating correctly.
Appliance is cycling on and off very
frequently.
Poor quality room thermostats, or location
close to draughts from opening doors etc.
Hysteresis temperature is too low.
External temperature located in position
where temperature is changing rapidly.
Consider upgrading controls and utilise
alternative locations.
Increase hysteresis parameter.
Ensure external temperature sensor is on a
north facing wall out of direct sunlight and away
from opening such as vents, doors and
windows.
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