Furnace Fault Codes With Descriptions And Solutions (Table 21) - Rheem RGFE Installation Instructions Manual

TABLE 21
FURNACE FAULT CODES EXPANDED W/DESCRIPTIONS AND SOLUTIONS
Key
FAULT
CODE
FAULT CODES
CODE AT DUAL 7-SEGMENT DISPLAY OF IFC & FAULT AREA OF COMM. THERMOSTAT : d1
MESSAGES TO HOMEOWNER AT COMM. THERMOSTAT: "CALL FOR SERVICE " & "CHECK FURNACE".
MESSAGE IN FAULT AREA OF COMM. THERMOSTAT: "NO SHARED DATA "
STATUS: This is a critical fault. The furnace will not operate in any mode.
DESCRIPTION: This code is displayed anytime there is no shared data at the furnace or (for communicating systems
only) on the network (e.g. at the condenser or thermostat). The shared data is electronically stored data that is used to
define (among other things) blower operation. Without the shared data, the furnace can not function. Note that shared
data may be available even if there is no card attached to the furnace control. A missing memory card will display fault
code "d4" if shared data is available on the network.
EXPECTED OPERATION: No operation (including thermostat) will be permitted without the shared data. The shared
d1
data defines the IBM (Indoor Blower Motor) speed-torque curve. Without this information, the IBM can not operate.
Refer to the section of this manual titled "INTEGRATED FURNACE CONTROL" under the subsection titled "MEMORY
CARD" for details on the hierarchy of use of multiple copies of shared data and distribution (among other details) of
shared data.
CAUSE: Typically, the memory card will be missing from the furnace. In most cases, the cause of this fault will be the
loss or disconnection of the original memory card from the furnace control (or I.F.C.). When the furnace control (or
I.F.C.) is replaced, the memory card must be broken away, saved and installed in the replacement control. This is
explained in detail in the section of this book titled REPLACING THE FURNACE CONTROL.
SOLUTION: Replace the missing memory card into the connector labeled J15 on the furnace control (I.F.C.). If the
original card can not be found, a replacement card can be ordered from ProStock. Be sure to order the correct
memory card for the furnace. Note: Furnace power must be cycled off and then on again after replacing the card or
the shared data will not be read.
CODE AT DUAL 7-SEG DISPLAY OF HP/AC & FAULT AREA OF COMM. THERMOSTAT : d3
MESSAGES TO HOMEOWNER AT COMMUNICATING THERMOSTATS: "CALL FOR SERVICE " & "CHECK
FURNACE".
MESSAGE IN FAULT AREA OF COMMUNICATING THERMOSTATS: AIRFLOW MISMATCH
STATUS: This is a critical fault. The air conditioner (or heat pump) condenser will not operate in communicating
mode.
DESCRIPTION: This message will not be displayed at the furnace. It will be displayed at the condenser but it involves
the furnace. It is an indicator that the maximum airflow that can be supplied by the furnace is not enough capacity for
d3
the condenser.
EXPECTED OPERATION: No cooling or heat-pump heating operation can take place. However, all other modes of
operation (including gas heat) should proceed as normal. Refer to the section of this manual titled "INTEGRATED
FURNACE CONTROL" under the subsection titled "MEMORY CARD" for details on the hierarchy of use of multiple
copies of shared data and distribution (among other details) of shared data.
CAUSE: The condenser selected is too large for the airflow capacity of the furnace.
SOLUTION: The condenser or furnace should be replaced with a condenser or furnace which will match the
necessary airflow requirements of the condenser. Check specification sheets for both the furnace and the condenser
to determine airflow capacity needed and supplied.
90
FAULT CODES
CODE AT DUAL 7-SEGMENT DISPLAY OF IFC & FAULT AREA OF COMM. THERMOSTAT
MESSAGES TO HOMEOWNER AT COMM. THERMOSTAT
MESSAGE IN FAULT AREA OF COMM. THERMOSTAT
DISPLAYED TEXT
STATUS
DESCRIPTION
EXPECTED OPERATION
CAUSE
SOLUTION
NO SHARED DATA
AIRFLOW MISMATCH