Primary Heater Does Not Heat

To avoid serious injury follow all warnings and instructions in the manual. Wear appropriate personal protective equipment.

Heat zone turned off

Turn on heat zones.

Breaker tripped

Check CB1 for A-side heater and CB2 for B-side heater

Faulty solid state relay (SSR)

While red temperature controller light is on, measure voltage (5 VDC) between T3 and T4 on SSR.
While red temperature controller light is on, measure line voltage (230 V) between T2 of the heater control relay and T2 of the SSR.
If testing fails to determine the problem, replace the SSR.

Primary heater temperature controller

The two primary heater controllers are interchangeable.
To test for a faulty controller, turn off the main power disconnect and disconnect incoming power.
Replace the suspect controller and retest.

Thermocouple

If there is a signal failure from the thermocouple, the thermocouple controller will prevent the heaters from operating.

If this occurs, replace the thermocouple. See Replace Thermocouple, in manual.
Check for a resistance of 4-6 ohms between purple and red wires on the temperature controller.
There should be a reading of infinity between the ground wire and purple wire.

Thermocouple position is critical to proper operation of the heater. Two conditions must be satisfied:

Thermocouple must make contact with the heater cartridge.
Heater cartridge must be functioning properly.
Lack of either of these conditions may cause erratic temperature control and possible overheating. To check thermocouple position, see Replace Thermocouple, in manual.

Heater cartridge

See Replace Primary Heater, in manual.