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VII. Trouble Shooting
PROBLEM CAUSE SOLUTION
No hot water at faucet Boiler does not operate Refer to boiler installation instructions
Check main service switch
Check fused disconnect
Circulator does not operate Check power supply
Check shaft coupling
Improper aquastat setting or calibration Turn tank aquastat to higher setting
Zone valve does not open (if used) Check power supply
Electrical problem (relay, wiring, fuse, etc.) Check fuse and replace
Check circuit breaker and reset (if applicable)
Check power supply
Scale build-up If boiler, circulator and tank are operating satisfactorily, coil
may have scale coating. See Section VI: Service Instructions
Clogged cold water filter or boiler supply
strainer (if used)
Clean or replace filter or strainer
Insufficient hot water Aquastat setting too low Adjust aquastat to higher setting
Undersized boiler with no priority to
domestic hot water
Rewire for priority
Peak use of hot water is greater than tank
storage capacity
Determine peak usage and compare to tank volume
Scale build-up If boiler, circulator and tank are operating satisfactorily, coil
may have scale coating. See Section VI: Service Instructions
Faulty tank aquastat Replace aquastat
Water at faucet too hot Aquastat set too high Lower aquastat setting
Improper system plumbing Compare plumbing to Section III: Piping
Improper system wiring Compare wiring to Section IV: Electrical
Boiler cycles more
than 5 times per
day in summer
Excessive demand Reduce demand or consider larger tank
Faulty aquastat Replace aquastat
Boiler high limit set too low Increase boiler high limit setting
Scale Build-up If boiler, circulator and tank are operating satisfactorily, coil
may have scale coating. See Section VI: Service Instructions
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