Install Instructions

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8. TROUBLESHOOTING
TROUBLESHOOTING
Table 8.1: Troubleshooting
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 circulator switching relay
Improper tank thermostats setting or calibration Turn tank thermostat 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
Air trapped in boiler supply to tank Purge piping
Insufficient hot water.
Tank thermostat Adjust thermostat 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
Undersized circulator Check recommended circulator size in Table 11.1 and 11.2
Faulty tank thermostat Replace thermostat
Water at faucet too hot.
Tank thermostat set too high Lower thermostat setting
Improper system plumbing Compare plumbing to Section 3
Improper system wiring Compare wiring to Section 4
Tank thermostat faulty Replace thermostat
Excessive boiler cycling
per day during summer.
Large demand Reduce demand or consider larger tank
Faulty tank thermostat Replace thermostat
Boiler high limit set too low Increase boiler high limit setting