CWH companion water heater — Product Manual
Troubleshooting
(continued)
Insufficient
hot water
1 Undersized water heater?
2 High-flow shower heads?
3 Boiler system improperly sized?
4 Check component parts.
5 Check boiler operating temperatures.
6 Check for air in the system.
7 Check tank temperature setting.
8 Check circulator speed.
9 Clean the boiler water system.
31
Excessive
domestic water
temperature
1 Boiler operating temperature set too
high?
2 Recirculation loop needed?
3 Thermostatic mixing valve set too
high?
4 No thermostatic mixing valve
installed or mixing valve is defec-
tive?
33
Boiler relief valve
lifting or weeping
1 Undersized expansion tank?
2 Faulty boiler expansion tank?
3 Faulty boiler relief valve?
4 Faulty boiler fill valve?
5 Tank heat exchanger coil leaking?
34
Temperature/
pressure relief
valve lifting
or weeping
1 Undersized or missing domestic water
side expansion tank?
2 Faulty domestic water side expansion
tank?
3 Faulty T & P relief valve?
4 High domestic water supply pres-
sure?
5 Possible water hammering or
pressure spikes?
6 Boiler operating temperature too
high?
35
Water on the
floor near the
tank
1 Check for leaks from sources other
than the water heater.
2 T & P relief valve lifting and discharg-
ing?
3 Loose piping connections or
drain valve leaking?
36
Top of tank or
enclosure wet
1 Check for leaks from sources other
than the water heater.
2 Loose piping connections?
36
Water quality
problems
1 Water smells like “rotten eggs.”
2 Milky water.
3 Discolored water from the hot
water faucet.
37
Figure 23 Typical problems and causes and page location for details
Problem Check possible causes Page
Part number 635-500-156/0113
30
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