Daikin DCG Series Installation Instructions Manual

Also see for DCG Series: Service instructions Installation and maintenance manual Installation instructions

22The diagnostic fault code is 1 flash for a lockout due to failed igni-tion attempts or flame dropouts. The integrated control will auto-matically reset after one hour, or it can be reset by removing thethermostat signal or disconnecting the electrical power supply forover five seconds. If the diagnostic LED indicates an external lock-out, perform the following checks:• Check the supply and manifold pressures• Check the gas orifices for debris• Check gas valve for proper operation• Check secondary limitA dirty filter, excessive duct static, insufficient air flow,a faulty limit, or a failed circulator blower can causethis limit to open. Check filters, total external ductstatic, circulator blower motor, blower motor speed tap(see wiring diagram), and limit. An interruption inelectrical power during a heating cycle may also causethe auxiliary limit to open. The automatic resetsecondary limit is located on top of the circulatorblower assembly.• Check rollout limitIf the burner flames are not properly drawn into theheat exchanger, the flame rollout protection device willopen. Possible causes are restricted or blocked fluepassages, blocked or cracked heat exchanger, a failedinduced draft blower, or insufficient combustion air.The rollout protection device is a manual reset limitlocated on the burner bracket. The cause of the flamerollout must be determined and corrected beforeresetting the limit.• Check flame sensorA drop in flame signal can be caused by nearly invisiblecoating on the sensor. Remove the sensor and carefullyclean with steel wool.• Check wiringCheck wiring for opens/shorts and miswiring.IMPORTANT: If you have to frequently reset your gas/electricpackage unit, it means that a problem exists that should becorrected. Contact a qualified servicer for further information.Pressure Switch Stuck Open (2 FLASH CODE)IA pressure switch stuck open can be caused by a faulty pressureswitch, faulty wiring, a disconnected or damaged hose, a blockedor restricted flue, or a faulty induced draft blower. If the controlsenses an open pressure switch during the pre-purge cycle, theinduced draft blower only will be energized.If the pressure switch opens after ignition has begun the gas valveis deenergized, the circulator blower heat off cycle begins, and theinduced draft blower remains on. The diagnostic fault code is twoflashes.Pressure Switch Stuck Closed (3 FLASH CODE)A stuck closed pressure switch can be caused by a faulty pressureswitch or faulty wiring. If the control encounters a pressure switchstuck closed, the induced draft blower remains off. The diagnosticLED code for this fault is three (3) flashes.Open Thermal Protection Device (4 FLASH CODE)If the primary limit switch opens, the gas valve is immediatelydeenergized, the induced draft and air circulating blowers are en-ergized. The induced draft and air circulator blowers remain en-ergized until the limit switch recloses. The diagnostic fault codefor an open limit is four (4) flashes.A primary limit will open due to excessive supply air temperatures.This can be caused by a dirty filter, excessive duct static, insuffi-cient air flow, or a faulty limit. Check filters, total external ductstatic, blower motor, blower motor speed tap (see wiring diagram),and limit. This limit will automatically reset once the temperaturefalls below a preset level.Flame Detected with Gas Valve Closed (5 FLASH CODE)If flame is detected with the gas valve deenergized, the combus-tion and air circulator blowers are energized. The diagnostic faultcode is five (5) flashes for this condition. The control can be resetby removing the power supply to the unit or it will automaticallyreset after one hour. Miswiring is the probable cause for this fault.ABNORMAL O PERATION - COOLING C ODESShort Cycle Compressor Delay (6 FLASH CODE)The automatic ignition control has a built-in feature that preventsdamage to the compressor in short cycling situations. In the eventof intermittent power losses or intermittent thermostat operation,the ignition control will delay output to the compressor contactorfor three minutes from the time power is restored. (Compressoris off a total of three minutes). The diagnostic LED will flash six (6)times to indicate the compressor contactor output is being de-layed.NOTE: Some electronic thermostats also have a built-in compressorshort cycle timer that may be longer than the three minute delaygiven above. If you are using an electronic thermostat and thecompressor has not started after three minutes, wait an additionalfive minutes to allow the thermostat to complete its short cycledelay time.