RT-SVX069D-EN
33
Troubleshooting
WARNING
Hazardous Service Procedures!
Failure to follow all precautions in this manual and on
the tags, stickers, and labels could result in death or
serious injury.
Technicians, in order to protect themselves from
potential electrical, mechanical, and chemical
hazards, MUST follow precautions in this manual and
on the tags, stickers, and labels, as well as the
following instructions: 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.
Standard Troubleshooting
Ignition Module
The Ignition Module (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 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 5.
3. Verify that the Digital Display on the mainboard is
displaying “–”. If the Digital Display is right, go to Step
5.
4. If the LED is not lit, verify that 24 Vac is present
between R and C. If the LED is not lit and 24 Vac is
present replace the IGN. If the Digital Display is not lit
and 24 Vac is present replace the mainboard. If 24 Vac
is not present, check fuse 2 on the mainboard and
check transformer (TNS1). Proceed to Step 5 if
necessary.
5. 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.
6. 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.
7. 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.
Failures
Heating Failure
Verify Heat Failure by Ignition Module (IGN) LED indicator:
Slow Flash: Normal, Heat Call
Fast Flash: Error Code:
Flash: System Lockout
1 Flash: Pressure Switch Fail
2 Flash: Primary Limit Open
3 Flash: Flame detected when gas valve is not open
4 Flash: Flame Rollout Open
5 Flash: W2 signal but no W1 signal
6 flash :Thermostat miswired (W1 and W2 swapped)
Simultaneous Heat and Cool Failure
Emergency Stop is activated.
To Clear an Alarm
Once the alarm has been identified and the cause has
been removed (for example, replaced faulty sensor), the
alarm can be cleared from the display.
Resetting Cooling and Heating
Lockouts
Cooling Failures and Heating Lockouts are reset in an
identical manner.
Method 1 section explains resetting the system from the
space; Method 2 section explains resetting the system at
the unit.
Note:
Before resetting Cooling Failures and Heating
Lockouts check the Failure Status Diagnostics by
the methods previously explained. Diagnostics will
be lost when the power to the unit is disconnected.
Method 1
To reset the system from the space, turn the “Mode”
selection switch at the thermostat to the “Off” position. After
approximately 30 seconds, turn the “Mode” selection switch
to the desired mode, i.e. Heat, Cool or Auto.
