PH-20/PHX-20 Manual
28
TROUBLESHOOTING
Heaters (cont’d)
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 located in the heater are shorted.
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 relay 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 4-
6 volts DC at A1 and A2 the proper reading should be 1 volt AC across L1 and L2.
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 9 and 10 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 of the controller is above the actual temperature reading
on the controller. Before replacing the controller read across position 1 and 2 to
make sure that the controller is powered up, your reading will be 208 to 230 volts
AC. If there is no voltage detected; check for loose wires or a malfunction of the
heater circuit breaker.
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