Hubbell Electric Heater Company WATER HEATER DF - Manual (Page 25)

25
SECTION V –
TROUBLESHOOTING
(See separate component O&M for additional details.)
Symptom Probable Cause Corrective Action / Remedy
Flame safeguard locked out. Reset flame safeguard.
Manual gas valve closed. Open gas valve and reset flame
safeguard.
Blown control circuit. Replace fuse.
No power. Reset circuit breaker.
No hot water.
Gas pressure too high or too
low. Reset gas pressure switch and reset
flame safeguard.
Operating control thermostat
set too low. Increase control thermostat setting to
a higher temperature. Note: Higher
water temperatures increase the
danger of scalding.
Input rate too low/not operating at
peak efficiency.
Call serviceman to check input rate
and efficiency. Water not hot enough.
Recovery rate too low for
demand.
Check firetubes for soot. Inspect and
clean for scale and sediment build-up.
Operating control thermostat
failed. Call serviceman to replace control
thermostat. Water temperature too hot.
Operating control thermostat
set too high. Adjust operating control thermostat to
lower temperature.
Temperature and pressure
safety relief valve not closed. Replace valve. Water leaks.
If leakage source cannot be
determined. Shut off fuel and electrical supply,
close cold water inlet valve, and call
serviceman.
Possible gas leak. Shut off gas supply and call the gas
company.
Improper combustion. Call serviceman.
Blower wheel dirty. Call serviceman.
Down draft in vent. Call serviceman.
Gas train vents not vented
outdoors. Call serviceman.
Gas odors.
Blower wheel running
backward. Call serviceman.