HeatStation™ CONDENSING WATER BOILER
40
34-1161 05/17
11
COMMUNICATIONS AND DIAGNOSTICS
11.1 Indicators
The PIM has three LED indicators to display operational status and to help diagnose system error conditions:
Power: Green LED indicating the PIM module is receiving 24 VAC power.
Alarm/Test: Amber LED which indicates the PIM is in Commission Test Mode or that a diagnostic alarm (fault)
is present.
Diagnostic Code: Red LED that is normally off. During a control or system fault condition, this LED flashes the
error codes.
11.2 Alarm Messages
– Diagnostic Codes (Flashes)
ALARM
MESSAGE
DESCRIPTION OF ALARM
LED
Flashes
MODBUS
CODE #
ID CARD
The ID card is connected to the PIM control board when the system is
initialized for the first time, the ID card selects the control profile to be
used. An ID card error may occur when the original card is replaced with
an incorrect card or has been disconnected from the PIM control board.
Red LED
ON,
Green
LED OFF
20
INTERNAL FAIL
The PIM control board may have failed. Replace the control board if
manually resetting the control does not correct the fault.
Red LED
ON
21
CTL SETUP
FAIL
Try resetting the defaults in the TOOL BOX menu. If unable to correct,
replace the control display
N/A
1
VENT LIM
The vent temperature sensor is approaching the programmed limit. This
will force the burner to operate at a reduced firing rate to prevent
overheating.
N/A
5
AIR FLOW FAIL
Indicates a blockage in the vent or condensate trap.
1
9
FLAME FLSE
A false flame signal is usually cause by a leaky gas valve which
propagates a flame after the call for heat cycle has ended. Check for
leakage through the gas valve. If no mechanical cause can be found,
replace flame control.
2
19
FLAME FAIL
Flame failure indicates that during the burner ignition process, the burner
either failed to light or it did light but no flame signal was detected. If the
burner fails to light it is likely that the hot surface igniter (HSI) is faulty or
the burner fuel/air mixture is too far out of adjustment to ignite. If the
burner lights but immediately go out, check for an inadequate gas supply,
faulty gas valve or regulator or poorly adjusted combustion.
3
15
FLAME LOSS
Flame loss indicates that sometime after flame has been established and
the burner is operating, the flame signal is lost. This can be caused by a
faulty igniter, damaged refractory or combustion that becomes poorly
adjusted as the burner modulates to higher inputs.
3
16
LOW HSI
The PIM control board is not sensing the correct amp draw from the HSI
(Hot Surface Igniter). This is most likely caused by a faulty or
disconnected igniter.
4
23
LOW 24VAC
The 24VAC supply to the PIM control is below the threshold for reliable
control operation. This may be caused by low voltage to the boiler or a
faulty 120/24VAC supply transformer.
5
24
VENT MAX
The vent temperature sensor is used to protect low temperature vent
systems from damage caused by high flue gas temperatures. When this
alarm occurs, first confirm that the vent material is suitable for the
application as well as the limit setting for this control. When this product
is operated with high return or inlet water temperature, the flue gas can
exceed the rating of low temperature vent systems.
6
17
Boil MAX
The boiler high limit temperature safety has exceeded its limit. This
condition may be caused by a sensor failure or a faulty control board.
7
18
ALARM
MESSAGE
DESCRIPTION OF ALARM
LED
Flashes
MODBUS
CODE #
