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ELECTRICAL - STANDING PILOT MILLIVOLT
POOL OR SPA HEATER
ELECTRICAL CHECK WITH MILLIVOLT GAS VALVE
CAUTION: For qualified service personnel only.
1. Filter must be on with adequate water flow through heater.
2. Gas valve must be in "ON" position. Thermostat set higher than pool water temperature.
3. Jumpers are for temporary check only. If left in place, they could cause the heater to burn up.
If pilot burner remains lit
Jump across pressure
switch terminals
If main burner does not
fire, remove jumper
Check for adequate water
flow from filter
Replace pressure switch
Jump across thermostat
If main burner fires,
remove jumper
If main burner does
NOT fire...
Jump across each
high limit and remove
jumper
Replace thermostat
Replace high limit that
caused heater to fire
Jump across both "TH"
wires on gas valves
Check gas supply, gas
line size, gas pressure.
Also check for insects
or debris in pilot output
If pilot burner
does not light
Light pilot
If pilot burner goes out
when main burner lights
or when gas valve knob
is released
If burner does not remain
lit, attach millivolt meter
and read pilot output
If below 500mV, check
gas pressure. Also check
for insects or debris in
the pilot burner
If main burner fires,
remove jumper
Replace
gas
valve
If main burner does not
fire, remove jumper
Remove both "TH"
wires from gas valve.
Relight pilot
If pilot burner stays on
Problem is a wire or
component short to
cabinet or low gas
pressure
If above 500mV,
replace gas valve
Clean filter
If main burner fires,
remove jumper
If output is still low,
replace pilot generator
Raw Output (700mV± 100)
Pilot generator disconnected from valve (knob
must be held down to keep pilot on).
White – Negative
Red + Positive
Pilot Load (500mV± 100)
Pilot generator connected to valve-Power
applied to pilot solenoid.
TP(Thermopile-Robertshaw)
PP(Power Pile-Honeywell)
TH TP – Common
TH PP – Common
Main Valve Load (200mV± 100)
Control/Limit circuit closed (All switches "ON")
TP(Thermopile-Robertshaw)
PP(Power Pile-Honeywell)
TH TP – Common
TH PP – Common
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