Super Hot EPP SERIES, Installation And Service Manual

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EPP SERIES INDIRECT WATER HEATERS – Installation and Service Manual
21
7.0 Troubleshooting Guide
Problem Possible Cause Solution
Tank control failure
•
Check wiring and power supply
•
Replace control
Aquastat not calling for heat
•
Check wiring
•
Replace aquastat
Air lock in domestic water loop
•
Purge and bleed piping
Circulator not operating
•
Repair or replace circulator
Zone valve not operating
•
Check wiring and power supply /
open manually to check
•
Replace zone valve
No Hot Water
Boiler not operating
•
Boiler control too low
•
Check wiring
•
Check disconnect switch
•
Check fuse or circuit breaker
•
Check wiring and power supply
Aquastat setting too low
•
Adjust aquastat to higher setting
Defective aquastat or improper
calibration
•
Replace aquastat
Undersized water heater
•
Install adequate water heater
Insufficient Hot
Water
Undersized boiler with no priority to
domestic hot water
•
Rewire for priority / check sizing
Undersized boiler with no priority to
domestic hot water
•
Rewire for priority / check sizing
Inadequate boiler water flow
•
Check circulator sizing
•
Ensure valve is open
•
Purge and bleed piping
Circulator capacity too low
•
Replace circulator with correct one
Slow Hot Water
Recovery
Scale build-up in tank
•
Chemical cleaning or repeated
flushing
Aquastat setting too high
•
Adjust aquastat to lower setting
Aquastat continuously runs
•
Check wiring
•
Replace aquastat
Improper system piping and/or control
•
Check piping and flow control valve
Improper system wiring
•
Check wiring
Water Too Hot
Tempering (mixing) valve
•
Read valve instructions or consult
with manufacturer
Inlet cold water pressure too high
•
Install pressure reducing valve
Excessive water pressure when
heating
•
Install proper thermal expansion
tank on cold water inlet
Discharge From
Relief Valve
Relief valve leaking
•
Replace relief valve