Troubleshooting
RT-SVX46G-EN
51
Zone Sensor LED 3 (Cool)
“On” when the cooling cycle is operating.
“Off” when the cooling cycle terminates or the LED fails.
“Flashing” indicates a cooling failure.
Zone Sensor LED 4 (Service)
“On” indicates a clogged filter.
“Off” during normal operation.
“Flashing” indicates an evaporator fan or condensate
overflow switch failure.
Below is the complete listing of failure indication causes.
System failure
Check the voltage between terminals 6 and 9 on J6, it
should read approximately 32 Vdc. If no voltage is present,
a system failure has occurred. Refer to Step 4 in the
previous section for the recommended troubleshooting
procedure.
Heating Failure
Verify Heat Failure by Ignition Module (IGN) LED indicator:
OFF
: No Power or Failure
ON
: Normal
Slow Flash
: Normal, Heat Call
Fast Flash
: Error Code:
1 Flash
: Communication Failure
2 Flashes
: System Lockout
3 Flashes
: Pressure Switch Fail
4 Flashes
: TC01 or TC02 Open
5 Flashes
: Flame w/o Gas Valve
6 Flashes
: Flame Rollout Open
Cooling Failure
•
Cooling and heating set point (slide pot) on the zone
sensor has failed. Refer to the “Zone Sensor Test
Procedure” section.
•
Zone temperature thermistor ZTEMP on ZTS failed.
Refer to the “Zone Sensor Test Procedure” section.
•
CC1 or CC2 24 Vac control circuit has opened, check
CC1 and CC2 coils, and any of the controls below that
apply to the unit (HPC1, HPC2).
•
LPC1 has opened during the 3 minute minimum “on
time” during 4 consecutive compressor starts, check
LPC1 or LPC2 by testing voltage between the J1-1 and
J3-2 terminals on the RTRM and ground. If 24 Vac is
present, the LPC’s has not tripped. If no voltage is
present, LPC’s has tripped.
Service Failure
•
If the supply fan proving switch has closed, the unit will
not operate (when connected to RTOM), check the fan
motor, belts, and proving switch.
•
Clogged filter switch has closed, check the filters.
•
If the condensate overflow switch is closed, the unit
will not operate. Make sure the float switch is not in a
tripped condition, and check for an “open” between
wires connecting to RTOM J6-1, J6-2 (ReliaTel™
controls).
Simultaneous Heat and Cool Failure
•
Emergency Stop is activated
Method 2
The second method for determining system status is done
by checking voltage readings at the RTRM (J6). The
system indication descriptions and the approximate
voltages are listed below.
System Failure
•
Measure the voltage between terminals J6-9 and J6-6.
•
Normal Operation = approximately 32 Vdc.
•
System Failure = less than 1 Vdc, approximately 0.75
Vdc.
•
Test Mode = voltage alternates between 32 Vdc and
0.75 Vdc.
Heat Failure
•
Measure the voltage between terminals J6-7 and J6-6.
•
Heat Operating = approximately 32 Vdc.
•
Heat Off = less than 1 Vdc, approximately 0.75 Vdc.
•
Heating Failure = voltage alternates between 32 Vdc
and 0.75 Vdc.
Cool Failure
•
Measure the voltage between terminals J6-8 and J6-6.
•
Cool Operating = approximately 32 Vdc.
•
Cool Off = less than 1 Vdc, approximately 0.75 Vdc .
•
Cooling Failure = voltage alternates between 32 Vdc
and 0.75 Vdc.
Service Failure
•
Measure the voltage between terminals J6-10 and J6-
6.
•
Clogged Filter = Approximately 32 Vdc.
•
Normal = Less than 1 Vdc, approximately 0.75 Vdc Fan
Failure = voltage alternates between 32 Vdc and 0.75
Vdc.
To use LED’s for quick status information at the unit,
purchase a BAYSENS110* ZSM and connect wires with
alligator clamps to terminals 6 through 10. Connected
