Appendix B: Troubleshooting
120
Phason
Problem
Possible cause
Possible solution
Variable fan or variable heat element
not running
Incorrect wiring
variable heating or cooling elements
Fuse open or blown
Check why the fuse was blown and
repair any problems. Replace the fuse.
Minimum Idle setting too low
Increase the minimum Idle speed setting.
Read
Idle off setting too high
Decrease the idle off setting. Read
Temperature set point is above
room temperature.
Adjust the temperature set point to the
desired temperature. Read
No power to fan/heater
Switch on the power.
Faulty fan/heater
Replace the equipment.
Circuit breaker open
Reset the breaker.
Fans turn off and actuators close
when zone temperature rises
Tunnel mode is active
Set tunnel turn off to know for stages you
do not want affected by tunnel mode.
Alarm relay not operating alarm
system
Incorrect wiring
Display showing unusually high
temperature
Extension cable connected to
temperature probe is providing a
poor connection
Check the extension cable connection.
Resolder it if necessary.
Damaged probe
Replace the temperature probe.
Variable speed 1 or variable speed 2
fan switches on, runs at full speed,
and then turns off. Keeps cycling.
Hysteresis not high enough. Outside
temperature rising and falling
quickly. Happens most often in the
spring and fall.
Adjust the hysteresis setting or overlap
the Variable speed 1 or variable speed 2
fan settings. Read
Staged heater cycles on and off
Heater set points are too close
together with variable speed fans.
Adjust the hysteresis setting. Read
Move the temperature probe closer to the
heater.
Widen the set points. Read
Programming heating and cooling
elements and temperature-based duty
cycles
Heater too large for room
Replace the heater with a smaller output
unit.
Stage is set up as a temperature-
based duty cycle
Remove the duty cycle from the stage’s
and cooling elements and temperature-
based duty cycles
Date/time not correct
Daylight savings
Forgotten PIN
Have a user with
“
Admin
”
access assign
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