Troubleshootin
g
Primary Heater
Before performing any troubleshooting procedures:
1. Relieve Pressure. See Pressure Relief Procedure, page 49.
2. Turn main power switch OFF.
3. Allow equipment to cool.
Problems
Try the recommended solutions in the order given for each problem, to avoid unnecessary repairs. Also,
determine that all circuit breakers, switches, and controls are properly set and wiring is correct before
assuming there is a problem.
Problem
Cause Solution
Heat turned off.
Turn on he
at zones.
Temperature control alarm.
Check AD
M for error codes.
Primary Heater(s) does not heat.
Signal failure from RTD. Signal failure from RTD.
Dirty R
TD connections.
Examin
e RTD cables connected
to TCM
s. Confirm RTDs are
not pl
ugged into opposite heat
zone.
Unplug and re-plug RTD
conne
ctors. Unplug and re-plug
RTD co
nnectors. Ensure RTD tip
cont
acts 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.
Fai
led heater element.
See
Replace Heater Element, page 67.
Control of primary heat is
abnormal; high temperature
overshoots (T4DA, T4DB) occurs
intermittently.
Si
gnal failure from RTD.
Se
e(T6DA,T6DB),Error Codes.
333024N
47
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