Sterling VS - Manual (Page 25)

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1. Replace.
2. Replace.
3. Replace
4. Braze joint if joint is exposed where
leak has occurred.
1. Repair or replace thermostatic air vent.
2. Clean coil and fi ns. Check fi lter and
clean.
1. Check circulation pump. Check for
blocked tubes.
2. Check voltage and correct. Check for
linted coil and clean. Check for
defective overload and repair or replace
motor.
3. On single phase motor replace motor.
On three phase motor, reverse two
leads to change rotation.
1. Change fan blade.
2. Clean fan blade.
SYMPTOMS POSSIBLE CAUSE(S) CORRECTIVE ACTION
Table 20 - Troubleshooting Guide
1. Frozen coil.
2. Defective coil.
3. Corrosion.
4. Leak in joint.
1. Check for air in coil.
2. Lint on coil fi ns.
1. No circulation of water through coil.
2. Short cycling of motor.
3. Backward rotating motor.
1. Damaged fan blade.
2. Dirty fan blade.
A. Leaking coil.
B. Poor output on steam.
C. Poor output on steam
or hot water.
D. Noisy or vibrating unit.