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If your system is equipped with a pressure switch, the function of the pressure switch is to turn the heater off if the
pump stops operating or if there is a restricted water flow (dirty filter, obstruction in the spa plumbing etc.).
The pressure switch has been preset at the factory to operate properly with your spas specific plumbing.
Adjustment or other service may be required if you observe a flow related problem (FLO or FLC on spaside
display). If adjustment is required, follow the next steps carefully.
IMPORTANT: After any pressure switch adjustment, it is important to test the control by
turning on the pump low speed and heater. While operating, unplug the pump, the heater
must turn off. If the heater stays on, plug the pump back in and readjust the pressure
switch to achieve proper operation.
1) With power to system turned OFF, remove the wires from the pressure switch terminals
(secure wires safely to prevent any chance of electrical shock).
2) Use temperature adjustment key to move “set point” temperature to its lowest setting.
3) Turn power to the system ON and activate the low-speed pump.
4) Place an Ohmmeter across the pressure switch terminals to verify an OPEN circuit.
5) Rotate the pressure switch adjustment screw counter-clockwise until the Ohmmeter indicates
a CLOSED circuit.
6) Turn pump OFF and verify that the pressure switch circuit is once again OPEN.
7) Turn power to the system OFF and reconnect pressure switch wires. Reapply power to the
system and operate the spa or hot tub as normal.
Adjustment
SPECIAL CONSIDERATIONS
Hydro-Quip 1A Pressure Switch
HQ PT# 34-0178
Adjustment Screw - Slotted
Hydro-Quip 1A Pressure Switch
HQ PT# 34-0178A
Adjustment Screw
T25 Torx, 5/32
Allen Wrench or
small slotted
screw driver with a
5/32 tip.
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