TROUBLESHOOTING – AHC CONNECTION
Symptom | Cause |
|
|
| Miswiring – Check wire colors to verify I- at AHC is connected to I- at |
| thermostat and I+ is connected to I+. |
No RH display, no outdoor | AHC power source – When wired to the Model 8570 thermostat, the AHC |
temperature display | must be wired to a continuously ON power source. Use voltmeter to verify |
| presence of 24VAC (nominal) at AHC. |
|
|
| AHC not operating correctly – check red diagnostic light on AHC. |
|
|
No RH display, outdoor temperature OK | No valid reading available – run fan for at least 40 seconds. |
|
|
RH display, outdoor temperature @ 20°F | AHC set for manual mode of operation. Wire an outdoor sensor to the AHC |
| or wire an outdoor sensor to the thermostat. |
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