54 RT-SVX23D-EN
Trouble Shooting
Simultaneous Heat and Cool Failure
1. 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 & J6-6.
Normal Operation = approximately 32 VDC
System Failure = less than 1 VDC, approximately 0.75 VDC
Test Mode = voltage alternates between 32 VDC & 0.75 VDC
Heat Failure
Measure the voltage between terminals J6-7 & J6-6.
Heat Operating = approximately 32 VDC
Heat Off = less than 1 VDC, approximately 0.75 VDC
Heating Failure = voltage alternates between 32 VDC & 0.75 VDC
Cool Failure
Measure the voltage between terminals J6-8 & J6-6.
Cool Operating = approximately 32 VDC
Cool Off = less than 1 VDC, approximately 0.75 VDC
Cooling Failure = voltage alternates between 32 VDC & 0.75 VDC
Service Failure
Measure the voltage between terminals J6-10 & J6-6.
Clogged Filter = Approximately 32 VDC.
Normal = Less than 1 VDC, approximately 0.75 VDC Fan Failure = voltage alternates between 32
VDC & 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 each respective terminal wire (6
through 10) from the Zone Sensor to the unit J6 terminals 6 through 10.
Note: If the system is equipped with a programmable zone sensor, BAYSENS119* the LED
indicators will not function while the BAYSENS110* is connected.
Resetting Cooling and Heating Lockouts
Cooling Failures and Heating Lockouts are reset in an identical manner. Method 1 explains resetting
the system from the space; Method 2 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 zone sensor to the “Off”
position. After approximately 30 seconds, turn the “Mode” selection switch to the desired mode,
i.e. Heat, Cool or Auto.
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