23
8.1B No Heat or Not Enough Heat (All Models)
• Symptoms: low speed pump or circulation pump (heating pump) not turning, panel heat
indicator not lit, panel is ashing FL2.
Standard Troubleshooting Approach
This applies to 2011-2013 J300 Models not 2014+
Turn power off. Disconnect
ow or pressure switch wire
from board (Fig. 5). Turn
power on. Does the FL2 er-
ror message go away?
1. All Models:
Remove wires at board.
2. Test ow or pressure
switch with ohmmeter for
continuity across switch
wires (Fig. 6-7). Does
meter read continuity (0
ohms)?
Remove ow or pressure
switch and inspect for debris
interference. Remove debris
if present. Test switch for
continuity (0Ω) when closed
and for innite Ω when open
(Fig. 6-7). Does switch oper-
ate correctly?
J-LX/J300/J200 Models with
circulation pump:
Install switch making sure
ow arrow points in direction
of ow and switch doesn’t
bottom out in tting (Fig. 8).
Retest system.
Is wire shorted?
Replace wire.
Make sure wire
is not shorted
when installed on
switch. For models
where the wire is
removable.
J200 Models
(without the
circulation pump):
Replace pressure
switch. Retest
system.
Replace ow or
pressure switch.
Replace circuit
board.
Yes
No No
Yes
Yes
Yes
Yes
No
No
Fig. 5
Infinite Ω
Continuity 0 Ω
Fig. 6
Infinite Ω
Continuity 0 Ω
Fig. 7
FLOW
Incorrect
Orientation
Correct
Orientation
Correct
Orientation
FLOW
Fig. 8
Pipe
End View
correct
incorrect
Arrows
not
aligned
Arrows
aligned
Closed
Pump off
Pump on
DCV ACV
DCA
OFF
1000
200
20
2000m
200m
2000k
200k
20k
2000
200
10A
200m
20m
2000µ
200µ
Ω
+
750
200
DCV ACV
DCA
OFF
1000
200
20
2000m
200m
2000k
200k
20k
2000
200
10A
200m
20m
2000µ
200µ
Ω
+
750
200
DCV ACV
DCA
OFF
1000
200
20
2000m
200m
2000k
200k
20k
2000
200
10A
200m
20m
2000µ
200µ
Ω
+
750
200
DCV ACV
DCA
OFF
1000
200
20
2000m
200m
2000k
200k
20k
2000
200
10A
200m
20m
2000µ
200µ
Ω
+
750
200
Open
DCV ACV
DCA
OFF
1000
200
20
2000m
200m
2000k
200k
20k
2000
200
10A
200m
20m
2000µ
200µ
Ω
+
750
200
Flow
Cable
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