Technical information

134
Chapter 5 GENERAL
FAULT - Warm water flow out of cold tap
Cause Cure
Hot water back feeding into cold line, Fit non-return valve in cold supply near tap
usually if mixer tap or single outlet
hot and cold taps are being used
FAULT - Water Heater pressure relief valve venting water
Cause Cure
Pressurised water system pump switching Refer to water supply note
pressure too high
Switched tap water system pump flow rate Refer to water supply note
is greater than tap flow rate capacity
FAULT - Water heater difficult to drain
Cause Cure
Drain plug partially blocked and/or drain Remove plug entirely and/or turn screw 1/4
screw at top left hand corner of outside turn
cowl not open
Hot taps not open preventing air entering Open taps
hot system to let water out.
Loops hanging in pipe runs Refer to installation instructions
WATER SYSTEM - FAULT FINDING (continued)