Rittal Air Conditioner Error Codes

 

Alert Codes	Priority-Alert Text-Steps to Clear
180	Critical. (Furnace / Air Handler / Outdoor Unit) The thermostat has found a problem with the (furnace, air­handler or outdoor unit) outdoor sensor. In normal operation after control recognizes sensors, the alarm will be sent if valid temperature reading is lost. Compare outdoor sensor resistance to temperature/resistance charts in unit installation instructions. Replace sensor pack if necessary. At the beginning of (any) configuration, furnace or air­handler control will detect the presence of the sensor(s). If detected (reading in range), appropriate feature will be set as 'installed' and shown in the 'About' screen. The alarm/fault will clear upon configuration, or sensing normal values.
200	Critical. (Furnace) The furnace roll out limit switch is open. Correct the cause of roll out trip. Reset roll out switch. Reset power to clear. Test the furnace operation. The alarm/fault clears after the furnace roll out switch is closed.
201	Critical. (Furnace / Air Handler) The system has lost communication with the (furnace or air­handler) indoor blower motor. Lost communication with indoor blower motor. Possible causes include: power outage, brown­out, motor not powered, loose wiring, condensation on air handler control without cover on breaker. Problem may be on control or motor side. Cleared after communication is restored.
202	Critical. (Furnace / Air Handler) The unit size code for the (furnace or air­handler) and the size of blower motor do not match. Incorrect appliance unit size code selected. Check for proper configuring under Unit Size Codes for Furnace/Air Handler on configuration guide or in installation instructions. The alarm/fault clears after the correct match is detected following a reset. Remove the thermostat from the system while applying power and reprogramming.
203	Critical. (Furnace / Air Handler) The unit size code for the (furnace or air­handler) has not been selected. No appliance unit size code selected. Check for proper configuring under: Unit Size Codes for Furnace/Air Handler on configuration guide or in installation instructions. Critical Alert. The alarm/fault clears after the correct match is detected following a reset. Remove the thermostat from the system while applying power and reprogramming.
204	Critical. (Furnace) There is a problem with the furnace gas valve. Check gas valve operation and wiring. The alarm/fault clears after the issue is corrected.
205	Critical. (Furnace) The furnace gas valve relay contact is closed. Check wiring on control and gas valve. The alarm/fault clears after the issue is corrected.
206	Critical. (Furnace) The furnace gas valve 2nd stage relay is faulty. Furnace will operate on 1st stage for the remainder of the heating demand. The alarm/fault will clear after the issue is corrected. If unable to operate 2nd stage, replace control.
207	Critical. (Furnace) The furnace hot surface igniter is open. Measure the resistance of hot surface igniter. Replace the it if it is not within the specified range found in IOM. The alarm/fault clears after the issue is corrected.
223	Critical. (Furnace) The furnace low pressure switch is open. Check pressure (inches w.c.) of low pressure switch closing during a heat call. Measure operating pressure (inches w.c.). Inspect vent and combustion air inducer for correct operation and restriction. The alarm/fault clears after the issue is corrected.
224	Critical. (Furnace) The furnace low pressure switch is stuck closed. Check operation of low pressure switch to see if it is stuck closed for longer than 150 seconds during a heat call . Measure operating pressure (inches w.c.). Inspect vent and combustion air inducer for correct operation and restriction. The alarm/fault clears after the issue is corrected.
225	Critical. (Furnace) The furnace high pressure switch is failing to close. Check pressure (inches w.c.) of high pressure switch closing during a heat call. Measure operating pressure (inches w.c.). Inspect vent and combustion air inducer for correct operation and restriction. The alarm/fault clears after the issue is corrected.
226	Critical. (Furnace) The furnace high pressure switch is stuck closed. Check operation of high pressure switch closing during a heat call. Measure operating pressure (inches w.c.). Inspect vent and combustion air inducer for correct operation and restriction. The alarm/fault clears after the issue is corrected.
227	Moderate. (Furnace) The furnace low pressure switch is open in run mode. Check pressure (inches w.c.) of low pressure switch closing during a heat call. Measure operating pressure (inches w.c.). Inspect vent and combustion air inducer for correct operation and restriction. The alarm/fault clears after the issue is corrected.
228	Moderate. (Furnace) The furnace control is not able to calibrate the pressure switch. Unable to perform pressure switch calibration. Check vent system and pressure switch wiring connections. Check the drain trap for blockage. The alarm/fault clears after a successful calibration.
229	Minor. (Furnace) The furnace control has switched to high fire ignition because the low fire pressure switch did not close in the allowed time. IFC switched to high fire ignition because low fire pressure switch did not close in allowed time. No action is needed.
240	Moderate. (Furnace) The furnace flame current is low. Check micro­amperes of the flame sensor using thermostat diagnostics. Clean or replace the flame sensor. Measure voltage of neutral to ground to ensure good unit ground. The alarm clears after a proper micro­amp reading has been sensed.
241	Critical. (Furnace) The furnace flame is going out while the furnace is heating. Shut off gas. Check for a gas valve leak. Replace the gas valve if needed. The alarm/fault will clear when a heat call ends successfully.
250	Moderate. (Furnace) The furnace primary limit switch is open. Check for proper firing rate on furnace. Ensure there is no blockage in the furnace and the duct work. Check for proper air flow. If limit switch is not closed within 3 minutes, the unit will go into 1­hour Watchguard mode. The alarm/fault will clear when a heat call ends successfully.
252	Moderate. (Furnace) The furnace discharge air­temperature is high. Check temperature rise, air flow and input rate. Check for dirty filters. The alarm/fault will clear when a heat call ends successfully.
270	Critical. (Furnace) The furnace is in Watchguard mode. The furnace igniter cannot turn on the flame. Check for proper gas flow. Ensure that igniter is lighting burner. Check flame sensor current. Check for dirty filters. The alarm/fault will clear on successful ignition.
271	Critical. (Furnace) The furnace is in Watchguard mode. The furnace low pressure switch is open. Check pressure (inches w.c.) of low pressure switch closing during a heat call. Measure operating pressure (inches w.c.). Inspect vent and combustion air inducer for correct operation and restriction. The alarm/fault will clear on successful ignition.
272	Critical. (Furnace) The furnace is in Watchguard mode. The furnace low pressure switch is open during run mode. Check operation of low pressure switch to see if it is stuck open during a heat call. Measure operating pressure (inches w.c.). Inspect vent and combustion air inducer for correct operation and restriction. The alarm/fault will clear when a heat call ends successfully.
273	Critical. (Furnace) The furnace is in Watchguard mode. The furnace flame is going off during a heating cycle. Check micro­amperes of flame sensor using thermostat diagnostics. Clean or replace sensor. Measure voltage of neutral to ground to ensure good unit ground. The alarm/fault will clear when a heat call ends successfully.
274	Critical. (Furnace) The furnace limit switch has been open for more than 3 minutes. The system will go into Watchguard mode. Check firing rate and air flow. Check for blockage. The alarm/fault will clear when a heat call ends successfully.
275	Critical. (Furnace) The furnace flame is out of sequence. The system will go into Watchguard mode. Shut off gas. Check for gas valve leak. The alarm/fault will clear on next successful ignition.
276	Critical. (Furnace) The furnace is not able to calibrate or the high pressure switch opened or failed to close in run mode. The system will go into Watchguard mode. Check vent system and pressure switch wiring connections. The fault/alarm will clear when the furnace calibrates itself successfully.
290	Critical. (Furnace) There is a problem with the furnace ignition circuit. The system will go into Watchguard mode. Measure resistance of hot surface igniter. Replace the hot surface ignitor it is not within specifications. The alarm/fault will clear on next successful ignition.
291	Critical. (Furnace) The heating airflow is below the minimum required level. The system will go into Watchguard mode. Check for dirty filters and other air flow restrictions. Check blower performance. The alarm/fault will clear when a heat call ends successfully.
292	Critical. (Furnace / Air Handler) The (furnace or air­handler) indoor blower motor will not start. The system will go into Watchguard mode. Indoor blower motor unable to start. This could be due to seized bearing, stuck wheel, obstruction etc. Replace motor or wheel if assembly does not operate or meet performance standards. The alarm/fault clears after the indoor blower motor starts successfully.

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