Paloma PH2-20R OFN Engineering Handbook page 89

While viewing burner chamber through
sight glass:
In 10 second intervals; cycle the water
heater 3 times by turning unit
"on – off; on – off; on – off"
Is there a visible
flame while unit
is OFF?
YES
Visibly inspect burner chamber through
sight glass
Is debris visible
on burner
assembly?
YES
Remove and clean burner assembly
Attempt to operate again. If unit displays 80
Error Code and flame IS visible while unit is OFF:
SVC 820-Tankless Gas Trouble Shooting Manual
80 – Error Code Diagnostic Chart
On Remote Control, go to Maintenance Mode 0Y table. For Maintenance
All Maintenance Mode '0Y' readings should be done immediately after
turning the unit OFF. IF Flame Rod(s) is detecting flame, Maintenance Mode
NO
NO
Replace Gas Control Valve
Mode instructions go to page16.
will display:
Indoor Units: 05
Outdoor Units: 01
Does 'OY' Status in
Maintenance Mode
indicate presence
of flame after 5
seconds?
YES
Disconnect Molex Connector from Flame
Rod(s). Cycle heater 3 times by turning
unit "on – off"; "on – off"; "on – off"
Does 'OY' Status in
Maintenance Mode
indicate presence
of flame after 5
seconds?
YES
Attempt to operate unit again.
If unit displays 80 Error Code:
Replace Control Board
Page | 89
Water heater appears
to be normal.
NO
Attempt to operate
again
Clean or Replace Flame
Rod(s)
NO
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