Alarms and Troubleshooting
100 OAU-SVX007A-EN
RTRM Failure Modes
Following is the listing of RTRM failure indication causes.
System Failure
Check the voltage between RTRM terminals 6 and 9 on J6, it
should read approximately 32 Vdc. If no voltage is present, a
system failure has occurred. Refer to Step 4 in
“Microprocessor Control,” p. 99 for the recommended
troubleshooting procedure.
Failure
CLP1 has opened during the 3 minute minimum “on time”
during four consecutive compressor starts, check CLP1 by
testing voltage between the J1-8 and J3-2 terminals on the
RTRM and ground. If 24 Vac is present, the CLP not tripped.
If no voltage is present, CLP tripped.
System Failure
Measure the voltage between terminals J6-9 and J6-6.
Normal Operation = approximately 32 Vdc
System Failure = less than 1 Vdc, approximately 0.75 Vdc
Failure
Measure the voltage between terminals J6-8 and J6-6.
Operating = approximately 32 Vdc
Off = less than 1 Vdc, approximately 0.75 Vdc
Failure = voltage alternates between 32 Vdc and 0.75 Vdc
Heat Module Ignition Board
The heat module, upon receiving a request for heating,
energizes the appropriate heating stages or strokes the
modulating heating valve as required. Units with indirect fire
furnace come with heat module with ignition board that
provides control, protection, and diagnostics for the furnace
system. For troubleshooting refer to Table 15 and Table 16 for
LED flash code keys.
WARNING
Live Electrical Components!
Failure to follow all electrical safety precautions when
exposed to live electrical components could result in
death or serious injury. When necessary to work with
live electrical components, have a qualified licensed
electrician or other individual who has been properly
trained in handling live electrical components perform
these tasks.
AVERTISSEMENT
Composants électriques sous tension!
Le non-respect de toutes les consignes de sécurité lors
de la manipulation de composants électriques sous
tension peut entraîner des blessures graves, voire
mortelles. S’il est nécessaire de travailler avec des
composants électriques sous tension, demandez à un
électricien qualifié et agréé ou à une autre personne
ayant la formation nécessaire pour manipuler des
composants électriques sous tension d’exécuter ces
tâches.
Table 15. LED flash code keys for heat module UTEC 1016-xxx Ignition Board
Troubleshooting Guide for UTEC 1016-xxx Ignition Board
LED Code System Fault Description Action
Steady On Normal LED is Lit
Control Operation Normal.
24 Vac is applied to the control.
Led is OFF Lockout LED is OFF.
No power or control hardware fault.
1. Check 120V is being supplied to heater transformer.
2. Check that 24 VAC is being supplied by transformer. Replace transformer
if not being supplied 24 VAC.
1 Flashes Lockout
Air pressure switch contact is open with
Inducer blower running.
Open pressure switch, limit switch or flame rollout switch.
1. Check air pressure switch hose and hose connection between switch and
fan.
2. Check reset switch is not tripped for rollout switch.
3. Check high limit switch is not open.
4. Replace pressure switch if contact does not close when fan is running.
2 Flashes Lockout
Air pressure switch contact is closed
when Inducer blower is not running.
Pressure switch stuck closed.
1. Check wiring between PS1 and PS2 on ignition control board for correct
connection and proper wiring.
2. Check pressure switch functions correctly with and without pressure.
3. Replace pressure switch if fails to function correctly.
To Next Page
Loading...
Need help?
General