Heat Pump Controller
Heat Pump Controller8733819577 (2019/02) Subject to change without prior notice
22 | Troubleshooting
Heartbeat LED
The Heartbeat LED will continuously pulse as long
as the controller is in normal operation. If this LED
light is solid it is an indication that the controller
has stopped running its normal sequence of
operation and needs attention.
Thermistor Resistance Versus
Temperature
Fig. 12 Type II Thermistor Temperature Curve
If during an HPC firmware update and there is
an update failure (e.g., caused by a power
outage), the control software on the HPC will be
corrupted. The HPC update failure will place the
HPC in safe mode and an update must be
performed to restore normal operation.
Safe mode (also known as “bootloader mode”)
provides the means to restore the HPC to
operating. Safe mode is indicated by a slow
heartbeat LED.
For the Heartbeat LED location, see Fig. 1 on
page #4.
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