Nortec GS Series - Manual (Page 76)

73 | GS Series Installation
Troubleshooting
Table 10: GSTC Warning Troubleshooting
GSTC Warning
Displayed
Description of Warning
Corrective action
by unit
Troubleshooting
IMW-X:IGNITION
FAIL The Ignition module
identified has failed to
ignite within the allotted
time
(4 minutes). The unit will index
to next available
burner in the
sequence. (1) Check sight port of problematic burner. Watch for
hot igniter (glowing red) followed by a flame.
(2) If igniter not hot, check for voltage.
Check wiring. Replace igniter if necessary.
(3) If igniter is hot but no flame, ensure gas supply
connected. Check for 24V at gas valve.
(4) If flame visible, check flame sensor wiring.
Check L1 not wired to N. Consult Factory.
APW-X:AP OPEN
WARN
The air proving
switch identified has
opened while the
unit was operating.
Unit will interrupt
operation and retry
three times.
After a third try a
fault is generated.
(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
remains closed during operation.
(4) Check for suction In pressure tubes. If
switch does not close it may be defective. Consult
Factory.
AOW-X:AP OPEN
WARN
The air proving switch
identified did not close
during blower start-up.
Unit will interrupt
operation and retry
three times.
After a third try a
fault is generated.
(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
remains closed during operation.
(4) Check for suction In pressure tubes. If
switch does not close it may be defective.
Consult Factory.
BHW-X:BLOWER
RPM HIGH
The indicated blower
has an RPM higher
than the lead blower
by more than the
allowable tolerance.
The unit will keep
monitoring blower
RPM and display
this warning if RPM
remains high.
(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
remains closed during operation.
(4) Check for suction In pressure tubes. If
switch does not close it may be defective.
Consult Factory.
BLW-X:BLOWER
RPM LOW
The indicated blower
has an RPM lower
than the lead blower
by more than the
allowable tolerance.
The unit will keep
monitoring blower
RPM and display
this warning if RPM
remains low.
(1) Ensure blower in question is securely
connected and is receiving correct
voltage.
(2) Verify blower control wiring connection.
Check blower diagnostic test for abnormalities.
(3) Ensure no restriction on blower.
Ensure no blockage of blower inlet.
(4) Blower speed may decrease due to wear. Safe to operate but
output may be reduced. Order new blower.
HMW: MAINT.
WARNING
The preset service
interval time has
expired.
The unit will
continue to run for
200 hours before a
fault is generated.
(1) Service unit. Consult maintenance
guide in the Nortec manual.
(2) Reset service interval time after
maintenance has been completed.