Troubleshooting - Rheem RPVS Series Installation, Operation & Maintenance Instructions Manual

R e s i d e n t i a l S p l i t
R e v. : 1 3 M a r c h , 2 0 1 5

Troubleshooting

General
If operational diffi culties are encountered, perform
the preliminary checks below before referring to the
troubleshooting charts.
• Verify that the unit is receiving electrical supply power.
• Make sure the fuses in the fused disconnect switches
are intact.
After completing the preliminary checks described above,
inspect for other obvious problems such as leaking
connections, broken or disconnected wires, etc. If
everything appears to be in order, but the unit still fails to
operate properly, refer to the "ICC Troubleshooting Process
Flowchart" or "Functional Troubleshooting Chart."
ICC Control System
The ICC control provide status and diagnostic information
that greatly enhances the ability to quickly diagnose system
faults.
NOTE In diagnosing common faults in the system
develop a logical thought pattern as used by experienced
technicians. The charts which follow are not intended to be
an answer to all problems but only to guide the technician's
troubleshooting.
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Comfort Control System Startup
If the communications wires are wired backwards at any
point the green LED (COMM STATUS) will always be on. If
this happens check the wires at each point to ensure they
are not reversed
Once all devices are connected power up the line and
low voltage system. When all devices are powered the
thermostat should detect the ICC control within 45 seconds.
The control has a set of bias dipswitches set at a factory
default to the ON position. These dipswitches are for future
use. DO NOT CHANGE THESE DIPSWITCHES.
Once the system is powered the airfl ow settings will be
confi gured for all devices. The ICC will send information to
confi gure airfl ow to the Blower control. If the Blower control
is incapable of supplying the required airfl ow a d3 fault will
be displayed on the thermostat and ICC.
All devices have a LEARN button. This button is for future
use and has no function at this time.
All airfl ow adjustments are made at the thermostat.
Items that can be changed are Airfl ow trim adjustment,
Dehumidifi cation Setpoint, and mode of operation. The
thermostat also has a wide range of fault and history
information.
Sensor Inputs
All sensor inputs are 'paired wires' connecting each component
to the board. Therefore, continuity on pressure switches, for
example can be checked at the board connector.
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The thermistor resistance should be measured with the
connector removed so that only the impedance of the
thermistor is measured. If desired, this reading can be
compared to the thermistor resistance chart shown in
Table 9. An ice bath can be used to check calibration of the
thermistor.
ICC Control System Troubleshooting Flowchart/
Functional Troubleshooting Chart
The "ICC Control System Troubleshooting Flowchart" is
a quick overview of how to start diagnosing a suspected
problem, using the fault recognition features of the ICC
control board. The "Functional Troubleshooting Chart" on
the following page is a more comprehensive method for
identifying a number of malfunctions that may occur, and is
not limited to just the ICC control.
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Comfort Control System Board Replacement
Verifi cation of a Comfort Control
replacement.
WARNING!
WARNING! HAZARDOUS VOLTAGE! DISCONNECT
ALL ELECTRIC POWER INCLUDING REMOTE
DISCONNECTS BEFORE SERVICING.
Failure to disconnect power before servicing can cause
severe personal injury or death.
Each control board in the Comfort Control
information specifi c to the unit the control is installed
in. This information is called shared data because it is
distributed (shared) on the HVAC network. The shared data
for a unit contains information that allows the unit to operate
correctly.
When a control board requires replacement, it is important
that the replacement control gets the shared data from the
old control. The primary way the replacement control gets
this information is by the memory card that is installed in
the old control. Remove the memory card from the old
control, but leave it attached to the unit by the plastic tether,
replace the control and reinstall the memory card on the new
control. Never remove the memory card from the unit or cut
the tether of a memory card as it is the most eff ective way
to transfer the shared data. The unit will operate without a
memory card, but a D3 error will be displayed on the ICC
7-segment LEDs.
The memory card from a diff erent unit should never be used.
failure is required before
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System needs
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