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8.1D No Heat Or Not Enough Heat
• Symptoms: Circulation pump (heating pump) is turning, panel heat indicator not lit,
panel is ashing FL1.
Standard Troubleshooting Approach
No
Verify hot tub is in
standard filtration mode
(page 21). Remove flow
wires from switch.
Increase set temperature
to Initiate a heat call, then
jumper flow switch wires
together (see fig. G).
Does heat indicator
appear and FL1 error
message disappear?
Is the circulation pump
(Heat Pump) moving
water?
Remove flow switch and
inspect for debris
blockage. Remove
blockage or replace
switch. Install flow
switch with arrow
pointing in direction of
flow. Make sure magnet
arm doesn’t bottom out
in fitting (fig. J).
1. Remove filter and
allow air to bleed out
of cartridge.
2. Check for proper
water level.
3. Check for clogged /
excessively dirty
filter
.
4. Is pump moving
water?
No
No
No
Ye
s
Ye
s
Yes
Yes
Ye
s
Remove flow switch
connector from circuit
board at point 11 (fig. H).
Place jumper across
exposed connector pins*.
Does heat indicator
appear and FL1 error
message disappear?
*Lightly scrape contact pins at
point 11 with a razor blade or
sandpaper to remove conformal
coating or oxidation from contact
surface.
Replace circuit board.
Repair or replace flow
sensor cable.
Clean connectors between
flow cable and switch.
See section 8.10 (pg. 42)
Test flow switch with
ohmmeter for continuity (0)
across switch terminals
(fig. I). Does meter read
continuity
(0) with pump on?
No
Danger: Electrical Shock Hazard Exists!
High Voltage Present On Circuit Board. Use Ex
-
treme Caution While Servicing Circuit Board.
fig. G
fig. H
fig. I
Temporarily Jumper
Flow Switch Cable
Wires Together as Shown.
fig. J
FLOW
Incorrect
Orientation
Correct
Orientation
FLOW
Pipe
End View
correct
incorrect
Arrows
not
aligned
Arrows
aligned
Temporarily
Short Pins
with Jumper
#6560-864
Flow
Cable
22
23
Infinite
Continuity 0
Pump off
Pump on
Open
Closed
Jumper