Troubleshooting
Why does my ventilation not turn on?
You may have ventilation turned off. See Enabling and disabling ventilation in the user manual.
Alarm relay not operating alarm system
Problem Alarm relay not operating alarm system Possible Cause Incorrect wiring Possible Solution Correct the wiring.
Staged heater cycles on and off
Problem Staged heater cycles on and off Possible Cause Possible Solution The heater set points are too close together with variable speed fans. Adjust the hysteresis setting. Move the temperature probe closer to the heater. Widen the set points. The ...
Relay does not switch load off
Problem Relay does not switch load off Possible Cause The relay is configured as ON Possible Solution Configure the relay properly.
Variable speed 1 or variable speed 2 fan switches on, runs at full speed, and then turns off. Keeps cycling.
Problem Variable speed 1 or variable speed 2 fan switches on, runs at full speed, and then turns off. Keeps cycling. Possible Cause The hysteresis is not high enough. The outside temperature is rising and falling quickly. This happens most often in ...
Variable fan runs at maximum
Problem Variable fan runs at maximum Possible Cause Possible Solution Incorrect wiring Correct the wiring. The fuse is open or blown. Check why the fuse was blown and repair any problems. Replace the fuse. The variable stage is configured as OFF ...
Display showing unusually high or low temperature
Problem Display showing unusually high or low temperature Possible Cause Possible Solution If you have more than one probe connected, press buttons 1 to 4 to determine which probe is causing the high or low reading. The probe is not a Phason probe. ...
Temperature does not change
Problem Temperature does not change Possible Cause Possible Solution There are no working temperature probes enabled or connected Make sure at least one working probe is enabled. The control is in temperature test mode. If the TEST LED is on, the ...
Staged heater cycles on and off
Problem Staged heater cycles on and off Possible Cause Possible Solution Heater set points are too close together with variable speed fans. Adjust the hysteresis setting. Move the temperature probe closer to the heater. Widen the set points. Heater ...
Alarm relay not operating alarm system
Problem Alarm relay not operating alarm system Possible Cause Incorrect wiring Possible Solution Correct the wiring.
Variable fan or variable heat element not running
Problem Variable fan or variable heat element not running Possible Cause Possible Solution Incorrect wiring Correct the wiring. Fuse open or blown Check why the fuse was blown and repair any problems. Replace the fuse. Minimum Idle setting too low ...
Variable fan or variable heat element runs at maximum.
Problem Variable fan or variable heat element runs at maximum. Possible Cause Possible Solution Incorrect wiring Correct the wiring. Minimum idle speed too high Decrease the mimimum idle speed setting. Variable speed range matches temperature set ...
Relay not operating load
Problem Relay not operating load Possible Cause Possible Solution Incorrect wiring Correct the wiring. Switch-on setting for stage incorrect Adjust the setting. Relay set to cool for a heater Relay set to heat for a fan No power to load Switch on the ...
No power and/or display
Problem No power and/or display Possible Cause Possible Solution A circuit breaker at service panel is off or tripped. Reset the circuit breaker. Incorrect wiring Correct the wiring. Display board inter-connect cable is not plugged into the power ...
Motors and fans slow down or stop
Problem Motors and fans slow down or stop Possible Cause Power surge, brownout, or power outage Possible solution You cannot do anything when it happens, but could avoid problem in future by providing proper voltage and/or protection to the unit.
Burn marks on boards and components
Problem Burn marks on boards and components Possible Cause Power surge, brownout, or power outage Possible solution You cannot do anything when it happens, but could avoid problem in future by providing proper voltage and/or protection to the unit.
Power supply Components blown out
Problem Power supply components blown out Possible Cause Power surge, brownout, or power outage Possible solution You cannot do anything when it happens, but could avoid problem in future by providing proper voltage and/or protection to the unit.
Alarm Codes and Error Messages
ALARM MESSAGE POSSIBLE CAUSE POSSIBLE SOLUTION High Temperature Alarm The temperature has gone above the high temperature alarm point. Try to lower the temperature by turning heaters down or off, or by increasing or turning on cooling elements (such ...