Bosch CF Series - Option Card Troubleshooting

Troubleshooting
19.2 Option Card Troubleshooting
Table 19 Option Card Troubleshooting
Option Card Troubleshooting
Problem Mode Check Then Action Additional Action
No Hot Gas Reheat
operation
Cooling/Hot
Gas Reheat
Is the H_OUT LED on
the Option Card
ON?
If Yes, check the
Hot Gas Reheat
Valve.
1. Ensure there is
24VAC betw
een
“H_OUT” and “C.”
2. Ensure the solenoid
is workin
g.
If action1 is true and
action 2 is
not, then
replace the Hot Gas
Reheat Valve.
If No, check if there
is 24VAC be
tween
“H_OUT” and “C”
on the Option
Card.
If there is 24VAC, then
replace the Option
Card.
No Economizer
operation
Cooling
Is the E_OUT LED on
the Option Card
ON?
If Yes, ensure the
Cool Setpoint in
the Option Card is
set above the
water
temperature.
If true, check the
Economizer Valve.
Replace the Economizer
Valve as needed.
No Boilerless Control
operation
Heating
Is the W_OUT LED
on the Option Card
ON?
If Yes, ensure the
Heat Setpoint in
the Option Card is
set above the
water
temperature.
If true and the unit is
equipped with electric
heat, then check the
electric heat
operation.
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CF Series Heat Pumps — 8733846299 (2024/11)