BOILER SYSTEM DIAGNOSTICS
Water Output Temperature Too Low - Oil or Gas Fired
PROBLEM
POSSIBLE CAUSE
SOLUTION
Burner firing normally but
with outlet temp lower than
rated
Thermostat set too low
Set the thermostat to proper output temperature.
Burner firing constantly
Inlet water too cold
If inlet water is freezing to the touch, the boiler may not be able to reach desired temperature
increase. Use a water supply with a higher temperature.
Sooting
Soot build up on the coil can keep the water from reaching the desired If inlet water is freezing to the
touch, the boiler may not be able to reach the desired temperature increase. Use a water supply
with a higher temperature.temperature. Remove all soot from the coil and check for smoking.
Scaling
The outlet fitting to the hose can get scale build-up and reduce heat exchange. Descale and
prevent further build-up.
BOILER SYSTEM DIAGNOSTICS - Boiler Controls
PROBLEM
POSSIBLE CAUSE
SOLUTION
No voltage solenoid
Boiler control or electrical problem A multimeter can be used to check continuity through controls and pinpoint the problem areas.
Solenoid coil does not
energize
Bad connection to solenoid coil
Electrical connections to solenoid valve coil should be tight and not corroded.
Coil bad
Check to see if fuel solenoid will energize when the proper voltage is applied. Solenoid may
need replacing.
Boiler control not activating
properly
If coil energizes when proper voltage is applied, check boiler controls.
Solenoid coil energizes
Problem occurring elsewhere
If solenoid valve coil energizes when the cleaner is operating in hot water the problem is
elsewhere. Check the air/fuel delivery.
