Emerson 3000/ITR Manuale Utente

No dehumidification

Control not calling for 

dehumidification

Check monitor status.

Compressor contactor not pulling in

See 7.5.1 - Compressor Functional 

Check and Table 14.

Compressor won't run; fuse blown or 

CB tripped

See 7.5.1 - Compressor Functional 

Check and Table 14. Check fuses or CBs 

and contacts. Check line voltage

Suddenly stops pumping

Clogged strainer or impeller

Clean out debris.

Suddenly slow pumping

Clogged impeller, diffuser, or line

Clean out debris and use strainer.

Excessive leakage around the pump 

shaft while operating

Worn seal or packing

Replace seal or packing.

Performance poor

Worn impeller or seal

Replace with new impeller or seal.

Suction lift too high

Relocate pump closer to supply.

Motor not up to speed; low voltage

Larger lead wires may be required. Check 

for proper line voltage (±10%).

Worn bearings

Replace pump

Noisy operation

Worn motor bearings

Replace pump

Low discharge head

Throttle discharge-improve suction 

conditions.

Debris lodged in impeller

Remove cover and clean out.

Cavitating pumps

Adjust system pressures.

No humidification

Humidifier pan not filling

Check water supply.
Check fill valve operation
Check drain stand pipe adjustment
Check for clogged waterline

Control not calling for humidity

Check monitor status

Humidity contact not pulling in

Check visually. If contact is made, check 

line voltage after contactor and fuses or 

CBs.
Check for open humidifier safety stat. 

Jumper between terminals P35-6 and 

P35-15. If contactor pulls in, replace 

safety. Remove jumper.

Humidifier bulb burned out

Replace bulb. Loosen lead on old bulb. 

Trim excess lead length on new bulb to 

avoid shorts.