Reznor ULSA 025(EC), Installation Commisioning Servicing & User Instructions

Page: 25 / 30

1701ULSA(EC)--EN, p. 25/30
13. FAULT FINDING

Fault finding may only be carried out by appropriately qualified persons !
In case of 3*220V it is possible that phase shift results into bad ionisation
Check if the
igniter
sparks!
Check
presence of
flame!
Check if the
ionisation probe
registers the min
value!
YES YES
NO
YES
Check if control
module reads the
measured value! Check if the
flame sensor
is not
corroded!
NO
YES
Replace flame
sensor!
Call for heat
YES
Check if the
ionisation probe
is touching the
flame!
NO NO
NO
Reposition
ionisation probe!
Check
connections to
flame sensor!
Check if the
unit is
grounded
[earthed]!
YES
Connect
ground wire
to unit
chassis!
Replace flame
sensor!
Replace control
module!
YES
YES
In case of a
LL net, swap
the 2 lines
NO
Check if the
igniter
sparks!
Check
presence of
flame!
Check if gas
valve has gas!
YES YES
NO
NO
Check if gas
valve is
electrically
connected!
Check if the unit
has the right
connector/resistor
NO YES
Replace with the
correct
connector/resistor
Call for heat
NO
Check for air
in the gas
line!
YES NO
NO
Check igniter
position relative
to the burner!
Check if the
valve connected
to the control
module!
YES
Reposition the igniter!
Bleed air from gas line!
Replace gas
valve!
YES
YES
Check if gas
valve wiring!
Replace control module!
YES NO
Check gas pressure and supply
voltage; if either is to low correct
and repeat the start procedure!