28
Follow the recommended procedure in the indicated order to solve the problem and avoid
unnecessary repairs. Make sure all Switches are in the correct position and Indicator Lights ON
before determining the existence of a fault.
PROBLEM
Primary heater does not heat and the display on the controller shows ambient
temperature.
SOLUTIONS
1. Check that the light on the on/off switch is lit when the heater is turned on, if
not replace the switch.
If the light is on, move to the next step.
2. Check the heater breaker in the main console, reset the breaker, if it
continues to trip, wrap an Amp Clamp around one of the wires coming off the
breaker. If the Amperage reading does not exceed the rating of the breaker,
the breaker needs to be replaced. If the breaker draws more than its rating
the most likely cause is that one or more of the fire rods are shorted. Remove
the heater cover, disconnect the wires and check each rod for resistance.
Refer to page 30.
If the breaker is not tripped, move on to the next step.
3. Open the console top and locate the solid state relays for the heaters, looking
over the console top from the front of the machine. There are two relays to
the left bottom of the console, the one to the far left is for the “A” heater and
the one to the right is for the “R” heater. With the heater on look to see if a
LED light is lit on the relay.
If there is no LED light on the solid state relay, move to the next step.
4. With a DC volt meter read across position A1 and A2 on the solid state relay
(smaller wires) if you have a reading of 4-6 volts DC and the AC reading
across L1 and L2 (Heavy wires) reads 208-230 volts AC replace the solid
state relay. With 24 volt DC at A1 and A2 the proper reading should be 1 volt
AC across L1 and L2. If the AC reading across L1 and L2 is .025 volts check
the over temperature switches in the heaters. A defective over temperature
switch will open a contactor disabling both Heaters and the Hose.
If there is no DC voltage to the relay, move to the next step.
5. Using a DC volt meter measure across position 5 and 6 on the back of the
heater controller this is the output of the controller and sends power to the
solid state relay, your reading will be 4-6 volts DC. If there is no reading check
to make sure that the set temperature on the controller is above the actual
temperature reading on the controller. Before replacing the controller read
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