Bosch HPC User Manual

Heat Pump Controller
Heat Pump Controller8733819577 (2019/02) Subject to change without prior notice
20 | Troubleshooting
Unit Status LED (Blink Code) Information
Table 7 Status LED Information
Heating and Cooling
Fault Status LED Code Fault Condition
NO FAULT
Status LED is OFF No fault
INVALID CALL
Status LED solid ON
Invalid call, possible thermostat
wiring issue
HIGH PRESSURE SWITCH
1 HPS open, Instant reaction
LOW PRESSURE SWITCH
2
LPS during a demand call (bypassed
for first 120 seconds)
FREEZE COAXIAL SENSOR
3
FZC below temperature limit
(bypassed for first 30 seconds)
CONDENSATE OVERFLOW
4
Sensed overflow (grounded) instant
reaction
BROWNOUT CONDITION
5
Sensed input voltage at or below 18
VAC
FREEZE EVAPORATOR SENSOR
6
FZE below temperature limit
(bypassed for first 30 seconds)
Troubleshooting Heating/Cooling
Indicator HTG CLG Behavior Solution/Action
HEARTBEAT LED
X X LED is flashing two times a
second
Normal HPC Operation.
X
X
LED is flashing at a slow
rate, one flash per second
instead of two
HPC application program is not running.
Connect to Bosch EasyStart app to
update or reload application.
X
X LED is solid ON
Reboot controller. If condition persists,
HPC application program is not running.
Connect to Bosch EasyStart app to
update or reload application.
X
X LED is OFF all the time
Reboot controller. If condition persists,
contact customer service to replace the
controller.
STATUS LED
X X LED is solid ON
Verify thermostat wiring to make sure (R),
(C), (G), (O), (Y1), (Y2), (W1), (W2), and
(H) are properly wired.

Bosch HPC Specifications

General

Brand	Bosch
Model	HPC
Category	Controller
Language	English