R801 - Diagnostic & Fault Codes

Rheem Gas Furnace: R801

Re: Diagnostic & Fault Codes

The furnace control comes standard with a 7-segment diagnostic display. 

During Standby mode (with no faults), the display will read "0". 

During normal Heating, Cooling or Continuous Fan operation, a letter will be displayed to describe the mode of operation:

• "C" = Cooling or Heat Pump Operation
• "F" = Continuous Fan Operation
• "H" = Gas Heating Operation

All lockout conditions can be cleared immediately provided that the original fault causing the lockout is cleared and power to the unit is cycled off and then back on again or (soft lockout only) if a heat call is cycled off for greater than 2 seconds but less than 20 seconds.

5-Minute Lockout

A five minute “soft” lockout will be initiated if the pressure switch fails to close after 60 seconds of continuous inducer operation at the beginning of a normal heat cycle (pressure switch proving period). The seven-segment display will display the appropriate fault. Lockout will automatically be reset after five minutes.

1-Hour Lockout

A one hour “soft” lock out will be initiated when:

• Flame has not been detected after four ignition trials.
• Flame has been lost for five times in one heat call.
• Undesired flame has been detected. The one-hour period will commence after flame is no longer detected.
• Dead Blower has been detected (main limit circuit open for more than 150 seconds)
• When voltage has unexpectedly been detected on the gas valve circuit and voltage goes away when inducer is shut off.

The seven-segment display will alternately display “10” and the code number for the fault causing the lockout. Lockout will automatically be reset after one hour.

Hard Lockout

Three conditions shall cause a hard lockout:

1. The control senses an unspecified internal fault. Fault code “93” is set and displayed. This lockout condition cannot be reset by cycling the heat call.
2. Voltage is detected unexpectedly on the gas valve contacts (welded relay) and will not clear by cycling the inducer. Fault code “93” is set and displayed. This lockout condition cannot be reset by cycling the heat call.
3. The furnace control will declare that the blower motor is inoperable (dead) if the main limit control has been open for more than 150 seconds. Gas heating is terminated. However, the control continues to try to operate heating for up to four attempts in case the blower motor starts working again. If a dead blower has been declared four times in one heat call, the furnace control enters a hard-lockout. Fault code “61” is set and displayed. This lockout condition CAN be reset by cycling the heat call.