Utica Boilers H2OI Dual 安装指导

The water heater is intended to provide many years of reliable service. Components, such as thermostats and relief 

valves, may be subject to failures that require service. Depending on the quality of the water supply, sediment and/or 

scale may coat the heating coil in the tank and reduce hot water recovery rate. Failure to use the correct procedures or 

parts can result in unsafe operation.

The owner should arrange to have the following inspections and simple maintenance procedures done at the suggested 

frequencies.

 

Boiler and Domestic Water Piping (Annual)
Check all piping for signs of leakage at the joints, unions and shut-off valves. Repair as required.

 

Temperature and Pressure Relief Valve (Annual)

 

Sediment (Annual except where harsh water quality may require more frequent service)
Depending on water conditions, a varying amount of sediment may collect in the tank. Levels requiring service 

are indicated by a small temperature difference between the boiler supply and return lines, and a reduced 

recovery rate. Repeated flushing usually clears such material. As a preventive measure, water should be drawn 

from the drain valve until it runs clear and the installation of a water filter should be considered. 

 

Scale (Annual)
Hard water may cause scale buildup on the outside of the heating coil inside the tank. A water softener will 

prevent this problem. Symptoms are identical to sediment buildup. If repeated flushing does not resolve the 

problem, chemical cleaning may be required. Contact a qualified contractor.

PROBLEM

CAUSE

SOLUTION

No hot water at faucets

Boiler does not operate.

Press reset button

Check main cut-off switch

Check fuses or breakers. 

Check power supply to boiler.

Circulator does not operate

Check power supply to pump.

Improper thermostat setting

Turn thermostat to a higher setting.

Zone valve does not open

Check power supply and valve

Electrical problem

Check fuses and replace.

Check circuit breaker and reset.

Check power supply

Clogged filter

Clean or replace filter.

Insufficient or runs out of hot water 

at the faucet

Thermostat setting too low.

Turn the thermostat to a higher setting.

Undersized boiler with no priority to do-

mestic water heating.

Rewire for priority.

Peak draw of hot water is greater than 

the tank storage.

Determine peak usage and compare to tank 

volume.

Sediment and/or scale buildup

Contact qualified contractor to clean coil.

Faulty water heater thermostat

Replace thermostat

Water at faucet too hot

Thermostat set to high

Lower thermostat setting.

Improper wiring or plumbing.

Compare to installation guide.

Boiler cycles more than 5 times per 

day in summer

Excessive demand

Reduce demand or consider larger boiler 

and/or water heater.

Faulty thermostat

Replace thermostat

Boiler high limit set to low

Increase boiler hi-limit setting

Sediment and or scale buildup

Contact qualified contractor to clean coil.

Faulty water heating element

Replace element