Nortec GS Series - Manual (Page 78)

75 | GS Series Installation
Table 11: GSTC Fault Troubleshooting
GSTC Fault
Displayed
Description of Warning
Corrective action
by unit
Troubleshooting
(screen)
IMF:NO
BURNERS AVAIL
All burners have
produced an ignition
module failure. No
burners are available
to produce steam. Unit is unsafe to
operate with this
fault. Investigate
the problem before
restarting unit. (1) Ensure gas supply is connected and open. Verify
gas supply pressure matches specification label.
(2) Check that igniters get hot/glow during
ignition sequence, followed by a flame.
Check wiring/voltage
(3) If igniter hot but no flame, check for 24V
at gas valve.
(4) If flame visible, check flame sensor
wiring. Verify L1 not wired to N. Consult factory.
AOF-X:AP FAIL
FAULT
The air proving
switch identified
did not close during
blower start-up
after 3 attempts.
Unit is unsafe to
operate with this
fault. Investigate
the problem before
restarting unit.
(1) Ensure pressure tubes are secure.
Check wiring to A/P switch and to driver
board.
(2) Ensure blower is operating. If not,
check wiring and power to blower. Check blower
relay.
(3) Perform blower diagnostic test to
ensure A/P switch closes and opens
during operation.
(4) Check for suction In pressure tubes. If
switch does not close it may be defective.
Consult factory.
ACF-X:AP
CLOSED
The air proving
switch identified
was closed while the
blowers were
inactive.
Unit will remain in
fault mode until
condition is
corrected or unit is
reset.
(1) Ensure pressure tubes are secure. Check
wiring to A/P switch and to driver board.
(2) Check for over/under pressure in room.
Verify proper vent installation. Check
termination for wind.
(3) Perform blower diagnostic test to
ensure A/P switch closes and opens
during operation.
(4) Potential faulty air proving switch. Contact factory.
BNF-
X:BLOWER
NOT OP
The indicated blower
is not operating or
registered an RPM
below 500 RPM while
being energized.
Unit is unsafe to
operate with this
fault. Investigate
the problem before
restarting unit.
(1) Check electrical connections. Ensure
feedback and power cables are connected to blower
and PCB.
(2) If blower not operating, ensure
blower relay is operating. Check
output from PCB.
(3) If blower is operating, feedback
signal could be missing.
(4) Perform blower diagnostic test to
verify controller is receiving signal. Consult factory.
GVF-X:GAS
VALVE FAIL
The indicated gas
valve was energized
out of sequence or
when not expected
to be energized.
Unit is unsafe to
operate with this
fault. Investigate
the problem before
restarting unit.
(1) Ensure electronics are connected
according to the wiring diagram.
(2) Check connections to all ignition modules
and gas valves. Ensure adequate supply voltage.
(3) Consult factory.
FTF:FILL
FAULT
The fill valve has
been active for an
extended time without
reaching level 1.
Unit will not
operate
without proper
water level.
Investigate
the problem before
restarting unit.
(1) Ensure water line is open and that
adequate water supply and pressure is available.
(2) Check wiring to float board and
fill valve. Check strainer on fill valve inlet.
(3) Check that drain valve, auxiliary
drain valve or manual drain switch are not
activated.
(4) Check fill valve using diagnostic
output test. Consult factory.