System fault and lockout LED (DS11 / DS14) alarm codes takes precedence over system status LED codes (cooling, heating stages or defrost/dehumidification).Only the latest active LED fault or lockout alarm code if present will be displayed. If no fault or lockout codes are active, then system status LEDs are routinely displayed. See notes 1 and 2 in table below for duration of fast / slow flashes and pause.
Heat Pump Control | icomfort |
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LEDs | Touch® | Condition | Possible Cause(s) |
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| Thermostat |
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DS11 | DS14 Red |
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Display |
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Green |
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| Moderate | Discharge line |
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Slow flash | On | Alert Code |
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temperature fault | This code indicates high discharge temperatures. If the discharge line temperature | ||||||
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| 414 | |||||
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| exceeds a temperature of 279ºF (137ºC) during compressor operation, the control | ||||
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| Discharge line | will de−energize the compressor contactor output (and the defrost output if active). | |||
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| Critical Alert | The compressor will remain off until the discharge temperature has dropped below | ||||
Fast flash | On | temperature | |||||
Code 415 | 225ºF (107ºC). |
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| Moderate / | Discharge sensor | The heat pump control (A175) detects open or short sensor or out of temperature | |||
Off | Fast flash | Critical Alert | sensor range. This fault is detected by allowing the unit to run for 90 seconds before | ||||
fault | |||||||
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| Code 417 | checking sensor resistance. If the sensor resistance is not within range after 90 | ||||
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3 fast |
| Moderate / | W output | When auxiliary heat output is detected as active. Fault in the heat pump control. | |||
flashes | Off | Critical Alert | |||||
hardware fault | Replace heat pump control. See figure 30 for further details. | ||||||
then pause |
| Code 418 | |||||
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3 fast |
| Moderate / | W output | If heat pump control recognizes five output hardware fault events during a single | |||
flashes | On | Critical Alert | hardware fault | cooling demand, the heat pump control will initiate a lockout. See figure 30 for fur- | |||
then pause |
| Code 419 | lockout | ther details. |
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| 3 fast | Critical Alert | W external | When auxiliary heat output is detected as active after compressor has been de−en- | |||
Off | flashes | ||||||
Code 421 | miswire fault | ergized. See figure 30 for further details. |
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| then pause |
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Simultaneous fast | None | Second−stage | If the unit is in non−communicating mode and it goes to second stage due to ambi- | ||||
heat lock−in | ent temperature being below second stage lock−in setting (E48). | ||||||
flashes then pause |
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Fast simultaneous flashing of DS11, | OEM mode | Factory test mode. |
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DS13, DS14 and DS15 |
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1.Pause duration is two (2) seconds.
2.Fast flash duration is 1/2 second. Slow flash duration is one (1) second.
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