Troubleshooting
22 309574L
No heat in A or B zones. Circuit breaker(s) tripped. Reset breaker CB3 or CB4, page 32.
Heat turned off.
Press or zone
keys.
Temperature control alarm. Check temperature displays for diag-
nostic code, page 10.
Defective heater. Replace, page 40. Check resistance.
Loose connectors or wire nuts. Check connections.
Failed temperature control board. Open cabinet. Check if board LED is
blinking. If not, check power wiring
connections to ensure board has
power. If board has power and LED is
not blinking, replace board, page 38.
Low heat in A or B zones. A and B temperature setpoints too
low.
Check setpoint. Increase if neces-
sary.
Flow too high. Use smaller mix chamber. Decrease
pressure.
Defective heater. Replace, page 40. Check resistance.
Loose connectors or wire nuts. Check connections.
Low voltage. Check that power supply meets
requirements.
Overheated temperature control
board.
Check fan operation.
Check if door is open; close.
Check that cooling holes are not
clogged or obstructed.
Fluid too cold. Preheat fluid.
PROBLEM CAUSE SOLUTION
A
B
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