Synesso MVP - Page 68

68
Category Symptom Possible Reasons & Soluons
Electronics
All zones read LO Check to make sure the element breaker is ON. Zones will read LO
unl the temperature in that zone reaches 175° F (79.4 C)
An individual zone
reads LO
Test the connecons at the probe and display
Test thermal overload (over temperature) switch
On machines built prior to 01-01-2011, Test the fuse for that zone.
Test connuity between the ends to check for a blown fuse. Test
that voltage from ground to the fuse reads 110v
[DISCONNECT POWER TO THE MACHINE FOR THIS TEST] Test con-
nuity from the heang element posts to ground, and the resistance
between the posts
If all these tests prove to be ok and the LED for the relay (on the
power board inside the electrical box) is ON, then the relay has failed
An Individual Zone
Reads HI or Above 250°
F and the Correspond-
ing Tank is Cooling
Test the connecons to the probe
Test probe for failure with ohm meter and compare reading to
neighboring probe
Tanks will Not Heat to
Full Temperature
Clean dust and debris from electronics box. Take a soft brush (clean
paint brush) to loosen debris and use a small vacuum hose to re-
move loose debris
Cold Zone
Solid State Relays can fail in either the ON or O posion
TRAINED OR AUTHORIZED PERSONNEL ONLY:
Relay has failed in the ON posion: The heang elements will not
turn o and they will overheat to a point where the thermal over-
load switch will trip and break the circuit to the element. With
power ON, test for voltage at the fuse:
 If voltage is present and the LED at the control board is not lit,
then the relay has failed ON
 If voltage is not present: TURN THE POWER OFF TO THE
MACHINE and test element leads for connuity to ground and
for resistance across the leads
Relay has failed in the OFF posion: Heang element turns o be-
cause of lack of signal. No other parts should be aected. Remem-
ber, when tesng for voltage, the solid state relay requires some
load to funcon. A failed open heang element, a tripped switch or a
failed fuse will make a solid state relay appear to have failed or be
OFF. If the LED at the relay is ON and there is no power at the relay: