RT-SVX058C-EN
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Troubleshooting
Standard Troubleshooting
The IGN has the ability to provide the service personnel
with some unit diagnostics and system status information.
Before turning the main power disconnect switch “Off”,
follow the steps below to check the Ignition Module (IGN).
To prevent injury or death from electrocution, it is the
responsibility of the technician to recognize this hazard
and use extreme care when performing service
procedures with the electrical power energized.
1. Verify LED on face of the phase monitor is green. If LED
is red, correct supply power fault.
2. Verify that the LED on the IGN is burning continuously.
If the LED is lit, go to Step 4.
3. If the LED is not lit, verify that 24 VAC is present
between R and B. If the LED is not lit and 24 VAC is
present replace the IGN. If 24VAC is not present, check
transformer (TNS1). Proceed to Step 4 if necessary.
4. If no failures are indicated, use the TEST mode
procedures described in the “Unit Start-Up” section or
thermostat to start the unit.This procedure will allow
you to check all of the external controls (relays,
contactors, etc) and the IGN.
5. Test the system through all of the available modes, and
verify operation of all outputs, controls, and modes.
Refer to the sequence of operations for each mode, to
assist in verifying proper operation. Make the
necessary repairs and proceed to Step 6 and Step 7.
6. If no abnormal operating conditions appear in the test
mode, exit the test mode by turning the power “Off” at
the main power disconnect switch and removing the
test mode connections.
7. Refer to the individual component test procedures if
other components are suspect.
Failures
Heating Failure - Low Heat Models
Verify heat failure by ignition module.
(IGN) LED indicator:
•
Steady OFF: Check Power or Bad Board
•
Flashing Slow (the LED flashes on for 3/4 second, then
off for 1/4 second): Normal, No Call for Heat
•
Flashing Fast (the LED flashes on for 1/4 second, and
off for 1/4 second): Call for Heat
•
Continuous On: Internal Error-Replace Control Board
•
2 Flashes: 1 Hour Lockout, No Flame
•
3 Flashes: Pressure Switch/Inducer Issue
•
4 Flashes: Open Temperature Limit Switch or Rollout
Limit
•
5 Flashes: Flame without Gas Valve
•
7 Flashes: Gas Valve Circuit Error
•
8 Flashes: Low Flame Sense
Heating Failure - High Heat Models
Verify heat failure by ignition module.
(IGN) LED indicator:
•
Steady OFF: Check Power or Bad Board
•
Flashing Slow (the LED flashes on for 3/4 second, then
off for 1/4 second): Normal, No Call for Heat
•
Flashing Fast: Not Used
•
Steady ON: Normal, No Call for Heat
•
2 Flashes: System Lockout: Failed to detect or sustain
flame
•
3 Flashes: Pressure Switch Problem Detected
•
4 Flashes: High Limit Switch Protection Device Open
•
5 Flashes: Flame Sensed and Gas Valve not Energized
or Flame Sensed and no "W" Signal
•
6 Flashes: Flame Rollout Switch Open
•
7 Flashes: Thermostat Miswired; W1 & W2
Cooling Failure
1. Cooling and heating set point (slide pot) on the
thermostat has failed.
2. CC1 24 VAC control circuit has opened. Check CC1 coils
and Frostat™ status. Check the status of the LED
indicator in LSD:
a. LED will be flashing to indicate a safety input has
opened while a Y call is present.
WARNING
Hazardous Service Procedures!
The maintenance and troubleshooting procedures
recommended in this section of the manual could result
in exposure to electrical, mechanical or other potential
safety hazards. Always refer to the safety warnings
provided throughout this manual concerning these
procedures. Unless specified otherwise, disconnect all
electrical power including remote disconnect and
discharge all energy storing devices such as capacitors
before servicing. Follow proper lockout/tagout
procedures to ensure the power can not be
inadvertently energized. When necessary to work with
live electrical components, have a qualified licensed
electrician or other individual who has been trained in
handling live electrical components perform these
tasks. Failure to follow all of the recommended safety
warnings provided, could result in death or serious
injury.
