32
ASO
Indicates that
the Air
Switch is
Open
Fault
“Air Switch Open”
This is displayed when
the boiler is expecting the
air switch to be closed by
a differential pressure
generated when the
combustion blower turns
on.
1 – Are the vinyl tubes connected between the air switch and the ports on the inlet
pipe? Negative side of switch connects to the port on the 1-1/2” PVC elbow (2” elbow
on Ti400).
2 – Check for blockage on the intake and exhaust vents.
3 – If fan is running the air switch may be faulty, ensure it is set at 0.2”wc. (Note:
switch on Ti400 condensate drain must be set at 3”wc.)
4 – If fan is not running, check 120V wiring to blower, if ok remove low voltage
harness from blower, if blower fails to start, replace blower, if blower does start
problem may be with blower or Sentry control.
ASC
Indicates that
the Air
Switch is
Closed
“Air Switch Closed”
This is displayed when
the boiler has turned the
blower off and is
expecting the air switch to
be open.
1 – Is the fan running. If so check for 24V between B and D terminals (see wiring
diagram). If 24V is not present replace transformer.
2 – Check venting termination with required venting described in manual.
Two Flashes
on Fenwal
“Flame Fault”
The Fenwal controller
senses flame prior to
ignition sequence.
If the combustion sequence is normal, and there is no flame prior to ignition, the Fenwal
control is defective, and must be replaced.
If the condensate drain gets blocked, the boiler will become flooded and terminate
operation as the flame rod becomes immersed. This will damage the flame probe. To
correct, free the drain blockage, and permanently prevent it from reoccurring. Remove
and dry off the probe. Reinstall the probe and try for ignition, if it fails to stay lit, leave
the fan run for up to three hours to dry out the insulation and probe.
Three Flashes
on Fenwal
“Ignition Lockout”
Reset Boiler so it will attempt to ignite.
Check for proper operation of ignition components. Make sure igniter glows and gas
valve opens.
Check for proper line pressure at gas valve when it opens.
If boiler lights check for flame signal between FC1 And FC2 on Fenwal control (If
lower then 1.2 DC µAmps see “
Boiler will not stay lit
”).
Check combustion properties.
Boiler will not
stay lit
.
Indicates lack of a flame
signal. In order to stay
running the flame signal
must be at least 0.7
µAmps
If the Burner light on the Sentry is going out, go to “
Burner shutting off
”.
Check condensate drain for blockage and check the inlet piping for ingested snow or
water (if the flame rod gets wet, it may need to be replaced). Check for resistance from
flame rod to ground, must be an open circuit (O.L), if not, remove rod and bent it away
from the burner slightly.
Check for proper polarity of line and neutral wiring to the boiler.
Boiler bangs
or hisses
Bangs or sounds like a
kettle while burner is
running indicates
insufficient flow
1 - Ensure the plumbing is as shown in manual. Check to see if pumps are operating
properly and water pressure is above 15psi.
This problem can lead to boiler
overheating!
2 - Boiler may be plugging-up with scale or magnetite, clean with Fernox DS-40
Descaler and Cleanser (NTI PN: 83450).
3 - If glycol is being used the concentration may be to high, recommend using a
concentration lower then 35%.
Sentry
Controller
Locks-up
Excessive noise, current,
or voltage spikes in the
120V power supply.
Check for voltage at the wires going to the A-C-T-O-D terminals of the Boiler.
Check the magnitude of the line voltage power supply.
Check the Amp draw of output C1 and Ap (max 3 Amp).
Check the Amp draw of control on start-up (max 6 Amps)
Display Goes
Blank
No power to control or
control failure
Check for 120V between terminals L1 and L2 at Sentry.
•
If 120V exists turn power off and remove line voltage harness from Sentry. Then
check for resistance between L1 and L2 of control, if the circuit is open (O.L) the
internal fuse has blown. Check for shorts in wires leading to circulators prior to
replacing the internal fuse. To access the internal fuse, remove the front decal to
reveal the screws securing the face plate cover.
•
If 120V not present, check wiring and for 120V at source.
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