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LL357D4 PDS, 4.2011 

Troubleshooting

Symptom

Remedy

No display

Check for 24 VAC at thermostat; display is blank when 
24 VAC is not present.

Indoor blower does not turn on

Verify wiring is correct. Check settings in Config Mode, 
No. 6, “Settings”.

All thermostat buttons are inoperative.

Verify 24 VAC is present; unit locks out when 24 VAC 
not present.

No response when first button is pressed.

First button pressed only activates backlight.

Air conditioners turns On and Off too frequently 
(short cycles)

Increase temperature differential. See Config Mode, 
steps 2 & 3. 

Status indicator light does not come on during 
call for Cooling or Heating. 

Turn status indicator light function on. See Config 
Mode, Step 14.

Room temperature is not correct.

Calibrate thermostat. See Config Mode, step 11.

Lock icon is displayed when any button is 
pressed.

Thermostat has the lockout function activated. See 
Lockout Feature and Config Mode, step 8.

Er on display instead of SEn temperature

Check for a bad connection at S1 and S2 terminals. 
See Config Mode, step 12

Air conditioner is not cooling or heating.

Verify wiring is correct. Gently pull on each wire to 
verify there is a good connection at the terminal bloc.

Problem not listed above

Press Reset once. Time and day are reset; 
configurations settings are not changed.

Содержание Marvair LL357D4

Страница 1: ...ng power outages no batteries required Programming not required Digital display shows temperature in F or C Room Temperature Offset Used to calibrate displayed room temperature with actual room temper...

Страница 2: ...box for control wiring to air conditioners Low Voltage Wiring 1 All wiring must comply with local codes and ordinances 2 Disconnect power to prevent electrical shock or equipment damage 3 On dual uni...

Страница 3: ...lectrical codes and ordinances Note Mount the thermostat about five feet above the floor Do not mount the thermostat on an outside wall in direct sunlight behind a door or in an area affected by a ven...

Страница 4: ...stem The LL357D4 functions with air conditioners with electric heat systems To configure the LL357D4 perform the following steps 1 Verify that the LL357D4 is in the OFF mode Press the SYS left button...

Страница 5: ...t up for Non Heat Pump and Type of Heat Electric Press the Up or Down button to select scale Press the Right button to advance to the next screen Press the Up or Down button to select Press the Right...

Страница 6: ...set to 0 will display Press the Up or Down button to select Press the Right button to advance to the next screen 12 Temperature Sensor 1 3 1 Only on board sensor determines room temperature 2 Only re...

Страница 7: ...n the lead lag control should be on One amber light will be on to identify the lead unit The other light should be off If the lag unit comes on with the lead unit the light for the lag unit will not c...

Страница 8: ...ode In this mode the thermostat controls the heating system When the heat is on the flame icon appears on the display Cool Mode In this mode the thermostat controls the cooling system When the the uni...

Страница 9: ...de steps 2 3 Status indicator light does not come on during call for Cooling or Heating Turn status indicator light function on See Config Mode Step 14 Room temperature is not correct Calibrate thermo...

Страница 10: ...of compressors Select non heat pump and Electric 1 GAS 7 Auxiliary Delay On Set the time delay in minutes for aux heat to be locked out after a call for second stage Set to 0 minutes 1 0 00 8 Lockout...

Страница 11: ...LL357D4 PDS 4 2011 11 Notes...

Страница 12: ...e at www marvair com for the latest product literature Detailed dimensional data is available upon request A complete warranty statement can be found in each product s Installation Operation Manual on...

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