Mars 70801 Instruções de Operação descarregar pdf (Página 7)

Troubleshooting

SYMPTOM CORRECTIVE ACTION

Display is blank Check thermostat wiring & connections.

Check circuit breaker/fuse panel.

No heat Set system switch to HEAT and raise set point above room temperature.

Check thermostat wiring and connections.

Check pilot light or HSI system on furnace.

No cool Set system switch to COOL and lower set point below room temperature

If snowflake is blinking, allow the 5 minute compressor lock-out to expire.

Check thermostat wiring & connections.

System turns on/off Adjust the differential setting on the thermostat.

too frequently or A high differential decreases cycle rate and a low differential increases

not enough cycle rate.

Display is not illuminated Touch the up or down arrow key. Display will illuminate for 10 seconds.

Room temperature and Normal (depending on differential setting).

set point disagree Check for drafts that could quickly change the room temperature

before the system is able to correct it.

System fan runs continuously Set fan switch to AUTO.

Check thermostat wiring & connections.

HI is displayed Reduce room temperature or allow a newly installed thermostat to

acclimate. HI indicates a room temperature reading greater than

90 F (32 C).

LO is displayed Increase room temperature or allow a newly installed thermostat to

acclimate. LO indicates a room temperature reading less than 45 F (7 C).

70801-IM 12/14/06 3:06 PM Page 7

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Mars 70801 Instruções de Operação Página 7