Error
Location
Type
Description
Cause
Solution
Inlet pressure
lower than defined
value.
Ensure that inlet pressure
to the pump is sufficient.
P2FB
HCM
Low Inlet Pressure B
Value defined too
high.
Ensure that the low
pressure alarm level
defined on the System
Setup screen is acceptable.
System
pressurized before
allowing heat to
reach setpoint.
Pressure in the hose and
pumps will increase as the
system heats up. Turn on
heat and allow all zones
to reach the temperature
setpoint before turning on
the pumps.
Bad pressure
transducer.
Verify the ADM pressure
reading and the analog
gauges at the manifold.
Replace transducer if they
do not match.
P4AX
HCM
High Pressure A
H-XP2 or H-XP3
system configured
as H-30, H-40, or
H-50.
Alarm level is lower for
H-30, H-40 and H-50 than
for H-XP2 and H-XP3..
Ensure dial on HCM is set
to position "3" for H-XP2 or
“4” for H-XP3.
System
pressurized before
allowing heat to
reach setpoint.
Pressure in the hose and
pumps will increase as the
system heats up. Turn on
heat and allow all zones
to reach the temperature
setpoint before turning on
the pumps.
Bad pressure
transducer.
Verify the ADM pressure
reading and the analog
guages at the manifold.
P4BX
HCM
High Pressure B
H-XP2 or H-XP3
system configured
as H-30, H-40, or
H-50.
Alarm level is lower for
H-30, H-40 and H-50 than
for H-XP2 and H-XP3..
Ensure dial on HCM is set
to position "3" for H-XP2 or
“4” for H-XP3.
334946A
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