Friedrich YL24J35A, Руководство по обслуживанию и запасным частям

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TTJ-0198 (10/97) (Page 31 of 64)
PROBLEM POSSIBLE CAUSE TO CORRECT
Set thermostat to a warmer position.
Replace – do not attempt to adjust.
Check compressor wiring. Check for open internal
or external overload Check wiring.
Test system switch.
No heating – fan
operates.
Thermostat setting.
Defective thermostat.
Compressor not operating.
Defective system switch.
Troubleshooting Heating
(Heat Pumps)
PROBLEM POSSIBLE CAUSE TO CORRECT
Restricted filter.
Outdoor thermostat
(Applicable models.)
Fresh air or exhaust door open.
Insufficient heating.
Clean as recommended in Owner’s Manual.
Check if outdoor thermostat is energizing the
heating element at its predetermined temperature
setting.
Check control setting.
Fan operates in
”constant” position,
but not in ”auto-
matic”, (Money-
Saver).
PROBLEM POSSIBLE CAUSE TO CORRECT
Check continuity of switch.
Incorrect wiring. Inoperative system switch.
Check applicable wiring diagram.
PROBLEM POSSIBLE CAUSE TO CORRECT
Defective thermostat.
Heat anticipator (resistor) shorted.
(Appl icable models.)
Temperature varies
from comfortable to
overly warm.
Incorrect differential setting. Replace thermostat.
Check voltage to resistor. If voltage okay, remove
resistor from thermostat bulb block. With current
on, feel resistor for warmth. If no heat can be felt,
replace anticipator.
Disconnect power to unit. Remove resistor from
thermostat bulb block. Plug in unit and allow to
operate. Feel resistor for heat. If no heat is felt,
replace resistor.
Replace thermostat and check.
Refer to appropriate wiring diagram. Resistor is
energized during the ”ON” cycle of compressor or
fan.
Room temperature
uneven.
(Heating cycle)
Heat anticipator (resistor) shorted.
(Applicable models.)
Wide differential – partial loss of thermo-
stat bulb charge.
Incorrect wiring.
PROBLEM POSSIBLE CAUSE TO CORRECT