Troubleshooting
Primary Heater
Before performing any troubleshooting procedures:
1. Follow Pressure Relief Procedure, page 49.
2. Turn main power switch OFF.
3. Allow equipment to cool.
Try the recommended solutions in the order given for
each problem, to avoid unneces sa ry repairs. Also,
determine that all circuit breakers, switches, a nd
controls are properly set and wiring is correct before
assuming there is a problem.
Problem Cause Solution
Heat turned off.
Turn on heat zones.
Temperature control alarm.
Check A DM f or error co des .
Primary He a ter(s) does not heat.
Signal failure from RTD. Check ADM for error codes.
Confirm RTD cabling is properly
connected and not damaged.
Replace RTD.
Dirty RTD connections. Examine R TD cables connected
to TCM. Confirm RTDs are
not plugged into opposite heat
zone. Unplug and re-plug RTD
connectors. Unplug and re-plug
RTD connectors. Ensure RTD tip
contac ts the heater element.
RTD not contacting heater
element.
Loosen ferrule nut, push in RTD
so tip contacts heater element.
Holding RTD tip against heater
element, tighten ferrule nut 1/4
turn past tight.
Failed heater element.
See
Replace Heater Element, page 59.
Control of primary heat is
abnormal; high temperature
overshoot s (T4DA, T4DB) oc cu rs
intermittently.
Signal failure from RTD. See (T6DA, T6DB), Error Codes.
334946A
47
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