RT-SVP07B-EN
127
DIAGNOSTICS Menu
Heat Failure
Module: HEAT
Problem: The Gas or
Electric heat controls has
failed or has marginal
performance and the Heat
Fail Input has closed:
a. for more than 80
seconds,
b. for 10 consecutive
occurrences (each lasting 5
seconds or more) within a
210 second period.
(This is typically caused
when the gas heater's
igniter failed to light the
gas, or because the electric
heat section became too
hot.)
Check Gas Heat: External
ignition controller, wiring,
combustion fan motor and
airflow operation, etc.
Check Electric Heat:
Wiring, sufficient airflow,
etc.
An Information Only
diagnostic is set.
(INFO) An automatic reset
occurs after the Heat Fail
input remains open for 210
seconds continuously.
Heat Module
Communication Failure
Module: HEAT
Problem: The RTM has lost
communications with the
HEAT module.
Check: Check unit wiring
between RTM and HEAT
module.
An “All Heat Off” request is
sent to the heat operation
function:
a. On staged gas or electric
heat units, all heat module
outputs will be de-
energized.
b. On hydronic heat or
chilled water units, the
supply fan will be turned
off, the outside air damper
closed, hydronic/chill water
valves will be driven to
100%, and the relay
outputs will be controlled
for proper signal routing to
actuators.
(PAR) An automatic reset
occurs after
communication has been
restored.
Table 11: Diagnostics Troubleshooting Chart (continued)
