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TROUBLESHOOTING GUIDETROUBLESHOOTING GUIDE
Series 44 Room Temperature Control
continued
Reproduced with permission from Maxitrol
®
Company
Symptom Possible Cause Field Test Remedy
1. If amplifier is proven at
fault, install replacement
amplifier.
2. If reading is incorrect,
replace the T244, TS244/
TD244 or repair wiring.
3. If proper action is obtained,
first check item 12.
Recalibrate if necessary.
1. Move TS144 to location
where average temper-
ature can be sensed.
2. If proper temperatures are
not observed, refer to
Discharge Air Temperature
calibration procedures.
1. Clean, replace valve and/
or seat if necessary.
2. Clean, or if necessary,
replace plunger.
1. If readings are incorrect,
replace the TS144 or
repair wiring.
1. Follow procedures
outlined in “Preliminary
Circuit Analysis” in Section
IX.
2. Remove wires connected
to amplifier terminals 4 & 5.
Set T244 or TD244 to
maximum setting. Measure
resistance across wires.
Meter should read 6000
ohms ± 1000 (T244). If
TS244/TD244 are used,
meter should read 4500
ohms ± 1000 (TS244) and
2100 ohms ± 150 (TD244).
3. Follow procedures outline
in “Preliminary Circuit
Analysis” in Section IX.
1. Compare sensed
temperature reading at
TS144 with average
discharge air temperature.
2. Follow procedures outlined
in “Preliminary Circuit
Analysis” in Section IX.
1. Remove bottom plate and
inspect valve and seat.
2. Inspect - plunger should be
smooth and clean and
operate freely in solenoid
sleeve.
1. Measure resistance per
item C3.
1. Faulty amplifier.
2. Short in T244 or
TS244/TD244 circuit.
3. Incorrect space
temperature calibra-
tion.
1. Improper TS144
location.
2. Incorrect discharge air
temperature calibra-
tions.
1. Foreign material
holding valve open.
2. Plunger jammed.
1. Open circuit in TS144.
E. Continuous
Minimum
Discharge Air
Temperature.
F. Incorrect
Maximum or
Minimum
Discharge Air
Temperature.
G. Continuous
High Fire
(Electronics
OK).
H. Continuous
High Fire
(Electronics
Problem).
Control circuits external to Series 44 can cause burner malfunction.
Always check manual valve to be certain gas is on, and check limit controls for normal operation.
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