Nortec GS Series User Manual

Page 78

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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.

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