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Problem
No heat
Heat zone turned off
System circuit breaker is off or
tripped
Thermocouple is not functioning
The temperature controller is not
actively trying to heat.
Electrical connections are loose or
damaged
Equipment electrical elements are
damaged
Failed temperature controller
The wrong temperature controller is
installed
Equipment
Fluid not covering interior heating
overheating
elements, interior heating elements
exposed to air
Flow and outlet pressure too low
Equipment set to exceed maximum
operating temperature
3A8940A
Cause
Solution
Turn on the heat zone switch.
Reset the circuit breaker.
Verify that the thermocouple wires are properly
connected to the temperature controller. Ensure
wires are not pinched.
Verify the temperature setpoint is correct. Adjust the
temperature setpoint as needed. Replace
temperature controller as needed.
Check for continuity between the electrical terminals
inside the equipment and power source. Ensure
terminal connections are secure. Replace damaged
parts as needed.
Check electrical continuity. Replace heater elements
as needed.
Check for continuity between controller and
equipment. Replace controller as needed.
Verify that the correct temperature controller for your
equipment is installed. See Technical
Specifications, page 30, for electrical requirements.
Ensure equipment contains fluid before turning on
heat zone switches.
Ensure the system is operating with a minimum flow
of 0.5 gpm (1.89 lpm) and a minimum outlet pressure
of 20 psi (1.38 bar, 0.14 MPa).
Ensure the set operating temperature does not
exceed the maximum temperature of 203°F (95°C).
See Technical Specifications, page 30.
Troubleshooting
17
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