Lennox Hp25 Error Light
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NEW Home » Forum » HVAC Forum » General HVAC Discussion » lennox hp defrost board codes lennox hp defrost board codes Watch Thread Tools Display Modes 01-19-2013, 10:03 AM #1 chris culver lennox model number tonnage View Profile chris culver Junior Member Send Message Follow Blogs (0) Threads (1) Photos (0) Reviews (0) Projects (0) Toolbox (0) View All Activity Junior Member Trade: hvac Join Date: Jan 2013 Posts: 1 lennox hp defrost board codes I have a lennox HP26 with a retrofit defrost control and no code ledger need to know what red and green status lights are Warning: The topics covered lennox heat pump error codes on this site include activities in which there exists the potential for serious injury or death. HVACSite.com DOES NOT guarantee the accuracy or completeness of any information contained on this site. Always use proper safety precaution and reference reliable outside sources before attempting any construction or remodeling task! 02-24-2013, 06:56 PM #2 GeoAlex View Profile GeoAlex Junior Member Send Message Follow Blogs (0) Threads (5) Photos (0) Reviews (0) Projects (0) Toolbox (0) View All Activity Junior Member Trade: hvac Join Date: Feb 2013 Location: Tampabay Posts: 5 Re: lennox hp defrost board codes Not sure why the codes would change from old board to new board if the new board is for the same condenser. If you dont have the old codes maybe this will help For original board: LED 1, LED 2, Code Meaning ==================================== OFF OFF Board failure or no power to board ON ON Board Failure Flash ON High Pressure switch open ON Flash Low Pressure switch open On Off Pressure switch lockout Alternating flashes means the unit is in short cycle delay Synchronized flashing means normal operation, power to board, but no call for heating or cooling. Tags board, codes, defrost, lennox « Previous Thread | Top of Page |
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HP21 Unit Information Page 14 Hide thumbs 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 http://www.manualslib.com/manual/800410/Lennox-Hp21.html?page=14 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 Latch 2: After the unit operates in low speed for 15 minutes consecutively, it switches to high speed until low speed demand is satisfied. Latch 3: After the unit operates in low speed for 30 minutes consecutively, it switches to high speed until low speed demand is satisfied. error codes Recall: Used in conjunction with the bypass button to recall the stored problem codes. Test: Used in conjunction with the control button to start test mode. Latch 2 or 3 modes are recommended in high humidity areas. If the jumper falls off or is removed, the control will continue to operate in the previously set mode until the control is reset due to loss of power, then the control will default to the Normal mode. TEST MODE lennox heat pump The control has a test mode. To initiate this mode, move the jumper to the test position and push the control button. The unit will operate in low speed for 10 seconds, turn off for ten seconds, then operate in high speed for 10 seconds. The con- trol will only go into the test mode if there is no thermostat demand and 5 minutes has elapsed since the unit ran. The in- door blower does not run during this mode. The test mode cannot run more than once every 5 minutes. LED LIGHTS Y1 and Y2 lights are connected directly to the inputs from the thermostat. They indicate low and high speed demand, re- spectively. The HI and LO lights are connected directly across the contac- tor coils. They indicate if the high and low speed contactors are energized. The HEARTBEAT light is connected to the microcontroller unit (MCU). It indicates when the control's MCU is operating cor- rectly, and also when the control is in delay mode. It blinks at a rate of four times a second when the MCU is operating proper- ly and at a rate of once every two seconds when in the delay mode (such as the 1 or 5 minute delay). If the LED is continu- ously on or off (assuming the power is on), the MCU is not operating
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